Fanboys and Fangirls alike are some of the most annoying creatures to walk this Earth.
I've compiled a list of the subjects most commonly obsessed over by some of the world's most annoying fans.
-My Little Pony
-Homestuck
-Hetalia
-Sonic the Hedgehog
-Smash Bros
-One Direction
-Adventure Time
-Xbox Live
-Pokemon
-PC Gamers
-Zelda
Probably the most annoying fans are the self-proclaimed "Bronies". These vile creatures will shove their oversexualized depictions of fledgling horses into just about anything, from video games to movies. If you are on a thread on a forum, discussing something unrelated to ponies, a "Brony" may show up and begin prattling on about his horses. Luckily, this strange group of fans seems to be dying out, with more and more members wising up and doing something worthwhile with their lives.
An honorable mention for the most annoying fans would either be Homestuck or the entire anime fanbase. The Homestuck fanbase is plagued with intense racism, major hipsterism, and a sense of supremacy that would make the KKK cringe. Like the Bronies, many Homestuck fans prefer to tout their hobby as a "lifestyle" and treat it as such, throwing buckets at people, dyeing their bodies grey, and generally acting like crazy 7th-grade girls.
The anime fanbase is disorganized and chaotic, with many problems. Many of these fans spend outrageous amounts of cash on anime, overpriced costumes, DVDs, and expensive convention passes. A good number of these fans choose to indulge in their sickening fantasies by reading or writing hardcore fan-fiction that would make any normal person puke. To add to the insanity of the fanbase, several fans will hold on dearly to an "OTP" or "One True Pairing". If someone states that they disagree with the pairing, or that the canon disagrees with it, the fans who support that pairing will go ape, screaming insults and accusations in broken, poorly-spoken Japanese.
Among the other fanbases, there are several ones that stick out. Besides the three I outlined, honorable mentions go to the sailor-mouthed, screaming, juvenile Xbox Live fanbase, the vapid, furry-obsessed, "original" character making Sonic fanbase, and the smug, elitist, self-proclaimed "pro" Smash Bros. Fans.