Why do people on here keep asking why Africans don't like Black Americans/Caribbeans?

Not to stereotype but I have met quite a few obnoxious Africans. (mainly older Nigerians) But I think that might be a foreign attitude (more likely individual ) because I have met quite a few obnoxious Pakistani's as well. (I mean they won't even hand things to you, they will toss it or put it on the counter, like my touch is somehow undesirable!)