I guess here's my take on it...
-Minecraft. As you can probably tell, I love Minecraft (and have been playing it for well over 3 years). However, there are some archetypes of Minecraft players that annoy me a lot.
A: The 8-year-old kid who says "MINECRAFT RULZ111!" and doesn't listen to anyone's opinion that could be critical (in that the game may not be perfect after all...)
B: The people who complain about how the game was "so much better back in Alpha/Beta" and constantly rant about new updates. (IIRC, the Minecraft launcher allows you to downgrade back to those versions now)
The haters can be pretty nasty as well, but I do sympathize with them when they are irritated by the fanboys. (The haters can also say they don't like Minecraft because of the age-old reason "The graphics suck.")
-One Direction. I've never had any use for One Direction's music and consider them to be a mediocre boy band, but their fans especially make me hate them. I've actually read up on their fandom, and some of the rules the "Directioners" set up actually feels like a cult to me.
Oh yeah, and then there was that whole thing that happened when Zayn left...*facepalm*
-Justin Bieber. Similar to One Direction, minus Zayn's leaving, but plus for that I find Bieber to be completely talentless.
-Bronies. I don't hate MLP (I don't like it either though), but they have irritated me in the past. (And I'm still a bit confused why grown men would watch a show targeted towards little girls.)
-Five Nights at Freddy's. Similar to Minecraft, I like the FNAF games. However, it does seem like most of the FNAF fandom is composed of Archetype A that is listed for Minecraft fans (as well as people who like to draw creepy fan art)
-SkyDoesMinecraft. For similar reasons as Minecraft and FNAF (I actually think his videos are funny, but his fandom can be quite annoying, and the butter thing was pretty ridiculous)
-Apple fanboys. Like Minecraft Archetype A, but perhaps worse. No phone out there is perfect (trust me, it's going to screw up sometime) but some believe that iPhones are supposedly God's gift to the world. (despite the fact that iPhones are very expensive and I find Apple's support system to be sub-par) And, they also criticize people who have different phones than them (I have an Android).
To be fair though, a lot of fandoms are centered around pretty cool things, such as Minecraft (there's a lot of creativity there) but they're unfortunately dragged down by the vocal minority that really ruins the look of the fandom itself. (haters can also be just as bad)
-Roblox (never had any experience with Roblox, but hear the fanbase is terrible)
-Sonic (same as Roblox)
-Fundamentalists (mostly Westboro Baptist)
-Feminists (I actually don't hate feminism, but "feminists" like Sarkeesian really irritate me)
-Taylor Swift's fandom (like One Direction, but not nearly as mediocre music and not as strict)
-And finally, the 12 year old "MLG SWAG KIDS". Swag is stupid, sorry to say that and no one cares how "pro" or "boss" you are. These overlap with PewDiePie, SkyDoesMinecraft, FNAF, and at least half of the rest.
Honestly, this post is gonna be kinda controversial...