Call Of Duty: You either Love the classics and hate the new games or Hate the classic's and love the new games, you will have to listen to grown men at 3 am getting into arguments with kids over why using a grenade launcher makes you and a quote "A Noob Launching Nigger Faggot". Also Kids. You will also have people start calling you a hacker if you're too good.
Counter Strike: Competitive scene is complete cancer and you will be bashed on if you make the slightest mistake if you queue up with randoms. You'll here grown men fighting with teens at 2 am for why using a certain gun makes you and I quote "A No Skill Nigger Faggot". You'll also run into Smurfers. Lots and Lots of Smurfers. People will get VAC'd and they'll cry about it in the discussion forums while people will tell them that they brought it upon themselves.
Unturned: Kids. Just Kids.
Day Z: Kos'ers. Nuff said
Undertale: If you haven't played it and you don't think this game is the second coming of Christ, "you need to play it". If you kill off a few key monsters, "NO don't kill Papyrus! He's my Skeleton Husband!!!!!!11111!" "No don't kill Toriel! She's my Goat Mommy!!!!!!!1111!!!!" Also Kids. Nuff Said
Youtuber Fandoms: Youtube Fandoms range from cool and understanding to just plain horrible and cringe worthy. If you don't like a certain youtuber, you're basically Hitler to them. If you like a Youtuber the fandom's person hates, You're basically Hitler.
Anime Fandoms: Doesn't matter if the author and artist say certain character's are together, They will keep shipping two opposite people together. If you like a certain anime that everyone hates, it's shit and you have shit taste.
Minecraft Fandom: This is low hanging fruit but to get a point across, people think that this game is the best thing ever and that you need to accept that into your mind. If you claim that a Minecraft Youtuber is shit, his legion of fans will insult you into oblivion. Also Griefers.
Roblox: This game's fandom…… it has a bunch of issues.
Musical Artist Fandoms: "(insert artist or band here) is way better than (insert modern day artists or bands here)" "(Insert artist's name) is utter trash! No one in their right mind would like them now! Their earlier work is better than this trash!" "You listen to (insert music genre here)? You have shit taste in music! Listen to (Insert favorite band or musical artist here in genre of music)! They are way better than your garbage music!"