These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
r/shitredditsays: Straw Feminists with Hair Trigger Tempers or a useful antidote to the rampant misogyny on Reddit? Either way, whenever a post gets featured on SRS, expect a flame war to break out between regular Reddit and SRS in the post itself.
r/mensrights and r/atheism are both very popular but also considered two of the worst subreddits to the point where there are multiple blogs and videos dedicated to bashing them, and the mere mention of them on Reddit (or offsite) will result in a Flame War.
A number of subreddits have split due to in-fighting. Perhaps the most infamous being the migration from r/marijuana to r/trees due to a controversial moderator.
With 4chan, although it is a bit more one-sided. 4channers are shown to despise Reddit, whereas Reddit seems to admire some of the more intelligent/witty posts that manage to come out of 4chan. (4chan thinks that this is stealing.)
And with Gawker Media. While Redditors hated Gawker for its alleged pandering to the Lowest Common Denominator, a few subreddits banned links to Gawker's sites after Violentacrez's doxxing/departure.
Also with Something Awful due to the so-called Redditbomb which led to all of the jailbait sub-reddits being shut down. Something Awful hates the site for being a haven of what they consider everything wrong with the internet, not in the least due to the child porn subreddits.
Fan Dumb/Hate Dumb: Any political, religious, atheist or technology section on the site.
GRANDMA TAKING A SHIT IN THE DARK: From a rage comic where the protagonist goes to the bathroom at night, only to discover his grandmother already using it without the lights on.
It went okay.: From a post where the poster claimed that his female roommate would masturbate daily and that he planned to walk in on her. When he finally did, "it went okay."
Rage comics tend to agree that the best solution to finding a spider in your house is to not be shy with the gasoline and burn your house down.
"No, that's [blank]. You're talking about [phrase].": These are long-running threads about a poster mistaking something for something that sounds similar (the [blank]). The [phrase] will be a description of something else that sounds similar, which the next poster will similarly debunk. Example.
Similarly, if someone makes a pun, a long thread of further punnery is almost guaranteed to happen.
SO BRAVE: Said in response to someone declaring a widely held opinion, such as "Creationists are stupid".
Jolly Ranchers/Doritos/Cumbox: Three infamous Nausea Fuel stories that invite a flood of "OH GOD WHY" comments whenever they're mentioned. Disgusting tales will inevitably be compared to one or all of these.
"Would you rather fight one horse-sized duck or a hundred duck-sized horses?" A traditional AMA question that first appeared in President Obama's AMA (he didn't answer it, but most people wish that he had).
"le lol omg le dis comic" and variants are mockeries of various reddit images and posts ("le" is often used by Reddit in just about everything).
"You have been banned from r/pyongyang" Refers to an incident where posters of r/MURICA! invaded and vandalized the r/pyongyang subreddit with American silliness. r/pyongyang completely shut itself off from public viewing and banned everyone involved. Now anytime a negative statement about North Korea is made on the site, someone will respond like this.
Alternately: "You are now a moderator of r/pyongyang" for positive statements about North Korea.
Ron the Death Eater: SRS loves to do this to Reddit as a whole, painting all of its (male) userbase as racist, misogynistic pedophiles. The rest of Reddit, in turn, treat SRS as evil, man-hating harpies because most people do not make racist, misogynist, or pedophilliac comments.
Rule Abiding Rebel: The "So brave" meme was created to make fun of users that claim to have controversial political and social opinions, but largely conform to acceptable opinions on reddit. "So edgy" is a similar catchphrase in SRS comment threads, with many of the same connotations.
r/jailbait, r/creepshots, and similar/related subreddits. It's a long story. The short version: Reddit's mods were reluctant to remove even subreddits distributing child porn because it was "against free speech"; it took media attention and a long campaign by Something Awful and affiliated sites for anything to be done about them.
Gawker Media. Already unpopular with reddit beforehand, Gawker published an expose on violentacrez (the creator of r/jailbait and various other creepy subreddits) that lead to him being fired from his offline job; a number of subreddits subsequently banned links to Gawker.
"Power users" with loads of comments and karma inevitably attract a hatedom, because internet points are Serious Business.
"Novelty accounts" (users who operate on a single gimmick, such as AWildSketchAppeared making a sketch of a comment or ActuallyTwoLlamas posting an image of two llamas instead of a relevant image), when the joke wears thin.
Why will you always receive downvotes for a neutral post or comment about something? Nobody knows, because if you try to ask, your comment will be downvoted into oblivion.
The people who complain about reposts.
Then you have the people who complain about the people who complain about reposts.
People who complain about people putting punchlines of pictures in the title whether the punchline would actually make sense without the context of the picture have been called this as well.
They complain EVEN if the picture's questioned punchline isn't even the punchline to begin with.
People who complain about memes, or people who complain about using memes "incorrectly".
People who complain about image posts.
Many posters on r/malefashionadvice will simply put down someone asking for an opinion on some even slightly out-there clothing item. There's a reason the sub is derided on the rest of reddit for promoting a "template" look.
/r/circlebroke and r/negareddit, having a tendency to dislike anything deemed popular on the rest of Reddit.