Hes “cocky” & flashy, while also being black. Same reason Pogba is despised. It’s a touchy subject but it definitely exists.
People are just salty he was shit for us and don't want to see him do well elsewhere. It would make 'em feel like they lost out on a good player. Wellbeck and Lukaku are viewed similarly. It's childish.
Pogba is disliked because people are salty he walked for free, was bought back for an enormous fee and isn't living up to that fee while his agent badmouths the club.
Plenty of white players are disliked by some too for a variety of reasons (Jones, Di Maria, etc)
Unless you're directly responding to a poster that used a bunch of tropes, maybe consider other people hold different opinions than you?
The guy scored 2 goals in 29 games for us and u think his skin colour is why he's disliked? Really?