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.
Discredited Meme: Nearly every meme becomes this after a certain amount of usage and timenote from a few months to a year on every board but /b/.
There are some memes that everyone is sick of hearing but persist long past their expiration date anyway; see Shiggy Diggy.
Attempting to predict one's post number is a bannable offense, and the classic "dubs" were removed on certain boards.
Any meme reddit has gotten its hands on instantly becomes this. If it is still used, it's used ironically.
A meme getting used on 9gag gets similar reactions.
Eternal September: Summer sees children on vacation, which leads to an influx of new users every year around that time. The problem is that this heavily impacts the quality of the site, and some "summerfags" stay afterwards. Then there's the group of people that believe "summer" doesn't exist, and that the boards were always terrible. The truth seems to be somewhere in between.
Foe Yay: 4chan supposedly despises Tumblr, but the more it tries to express it's hatred the more they're intertwined. A large part of this is because 4chan is an ineffectual Unknown Rival to Tumblr at best (to the point that 4chan/Tumblr is a ship on Tumblr) which makes the 4channers look more desperate than anything.
Fountain of Memes: Many memes that were spread across the internet originated on 4chan themselves.
Hypocrite: 4chan complains about Reddit stealing memes, yet a few memes (That Feel) are used on the site that aren't original. Unlike Reddit, however, 4chan recognizes they didn't create the memes and people generally know its origin (Krautchan).
Humans Are Bastards: 4Chan and Reddit are most notorious for their hateful vitriol, casual racism, sexism, and homophobia, an uncontrollable amount of cyberbullying, encouraging teenage suicide, and being seen as the nucleus of the most rotten aspects of internet and fan culture. The boards are treated with heavy scorn and disgust by those who do not frequent them. 4chan at least seems self-aware of it's reputation and engages in quite a bit of Self-Deprecation, but apparently prefers complete freedom with a higher than normal amount of assholes to a strictly controlled but nice site.
Non-Indicative Title: /v/- Video Games. Roughly only half of the posts have anything to do with vidya.
The Scrappy: You will get a lot of answers as to which board is the worst. These, however, are the most commonly accepted.
/v/ is viewed as this by the rest of 4chan due to acting idiotic at best, incomprehensible at worst. It's the only board other than /b/ that has zero real topic (ostensibly it's for video game discussion, but it's rare to see a thread not get derailed two seconds in). Even moot himself thinks it's stupid.
/pol/ has a similarly poor reputation due to being pretty much nothing but political bickering and fighting over who's ideals are better.
/mlp/ reigns supreme as the king of this trope. Everyone hates /mlp/ but paradoxally agree that it is essential, acting as a 'containment board' for the pony threads. /mlp/ just finds it hilarious.
Seasonal Rot: Depending on who you ask, the quality of 4chan as a whole may have decreased with the influx of users from Reddit, normalfags, and people in general whobrowse for the memes. Then again, you will find people that say that the website was always horrible.