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.
The entire game if you're an innocent. More than a few accidental teamkills will result from this.
The other "classes" have this same issue. If you are a Traitor, most of your time will be spent trying to commit your crimes wondering "are they going to figure it out?" and looking over your shoulder for witnesses. The Detective meanwhile has to find the Traitors as fast as they can, all the while having a massive target on their back since the Innocents will be crippled without them.
Jihad bombs, if your server has them installed and many people run close together.
"Stop Having Fun" Guys: Some parts of the fandom are very vocal about certain Let's Play videos, in part because of RDM note "random death match", done when someone is killed without legitimate reason, ghosting and the use of communication programmes other than in-game voice chat or typing.See below:
SeaNanners is probably one of the more notable examples, since he caused the game to rise in popularity, causing his impressionable fanbase to copy him. For further context, Nanners plays on a private server with close friends, whereas his more irrational fans join random games with strangers and are seen to unbalance the game with behaviour that will result in a pretty instant ban.
The irritation about bad behaviour doesn't just extend to fandom reaction. Some more extreme fans want the gamers in question to stop doing it on their own, private servers, when everyone is okay with it.