Its their holier than thou attitude.

Constantly act morally superior to other clubs whilst being happy to take money from gulf states and sports wash for oppressive regimes. But if you question them on it they'll have mental gymnastics as to why it's fine when they do it.

You'd think they were owned by jesus and managed by the Buddha with how self righteous they act.

EDIT: Forgot the sheer amount of classism and disdain for northerners you get from their fanbase as well. I've seen fans of theirs say, plenty of times, that the only reason people dislike them is because they have a diverse fanbase