Zlatan (I know I started the comparison) is different in the fact that he is more self aware about it and clearly makes it a bit of an over the top act. I wouldn't really call Memphis opiniated really, just a made up character. As I mentioned, Noa Long isn't black, acts exactly like Memphis and is slated for it. Though I have to concede that racists hate Noa Lang because he has that weird adopted accent.Zlatan is well liked by the general public in Holland. You should know this as a Feyenoord fan.
It's the attitude coupled with being black that gets on people's nerves.
I've personally found the average Dutchman's hatred for Memphis to strongly correlate with racist views. People like you and me think he's an idiot, but don't get roused up by his attitude.
If Memphis was white, he'd be considered a badass, like Zlatan.
Name me a black and opiniated person in Holland that is not deeply disliked. Even Gullit gets a lot of shit nowadays.
Bottom line, I'm sure racism is also involved, it's just mostly his attitude I think.
As for a well like opiniated black man. It's a sad fact I cannot think of any. Or that I can't think of a prominent black politician / talkshow host / TV presenter from the top of my head.