after playing both factions extensively there are lots of superficial reasons
night elf male hunters-either vanilla wow players that are unspeakably good, or just bad fucking children
male draenei paladin-especially with transmog now, everyone trying to be the TBC cinematic draenei. usually they are always bad. like bopping themselves and attempting to hearth bad
keyboard turners-a free kill in any pvp situation.
druids with some form of resto/feral/cat/bear/tree/moonkin/anything-i am guilty of this myself, but only named myself what i did to annoy other people
anythingQT-these people should be euthanized. yea im gunna put QT at the end of my name damn im cool and original.
human male ret paladins-goku hair, check. autismal name, check. horrible player and a free kill? check.
deathknights with anything related to dark/death/scourge/arthas/knight/Xxsupakillaxx-12 year olds.
people who advertise their streams in trade-tryhard bads screaming for attention. only once did i see somebody who was actually skilled.
male orc rogue-in TBC on my server there was this massive troll who played male orc rogue, he was annoying as fuck.
all hunters-i automatically assume they are bad and retarded until they prove otherwise
all deathknights-see hunters
all warriors that dont have a rank 1 title-see hunters and death knights
all frostmages-see above
dual wielding blood dks with spellshattering and gemming for all stam-uninstall
anyone that uses the blizzard store mounts-90% of the time they are just being annoying on purpose, but there is that small percentage that is actually serious about them
bronze drake-casual that uses gearscore, has a quel delar and wears both +hit badge trinkets because of the item level. (wotlk paladins everywhere).
rogues in anything that isnt t5/t6/merciless/vengeful-either a nostalgic vanilla wow player, or a horrible person
death knights wearing the starting gear-what the shit
all females wearing skimpy clothes-moon guard is that way
warriors dual wielding armageddon and wearing full wrathful, generally an orc or worgen warrior-attention whore, bad player and a free kill.
i could go on forever.
from playing this game from vanilla, ive seen a lot of horrible players fulfilling all stereotypes, nothing really shocks me anymore, i just tend to hate everyone now until i get to know them.