I’m talking about on the coli not who I meet irl. I’ve never heard someone say this irl
I have, it's more subtly inferred. It's definitely the more suburban type of peeps, but not solely limited to them. I mean I'm from the suburbs, but I'm also not oblivious to how nonblack people are and their views of blacks.
Matter of fact, growing up around nonblacks, I really started to distance myself from them, when they said I was different, because I prospered in school and was able to articulate myself in certain ways. In reality in never fell for that rhetoric, because I still have been around enough black people my whole life to know there's a wide range of good, bad, and intelligent peeps, even if they may not fit the stereotypical lens of a professional / productive person. But I can see how it happens.
It definitely comes from a state of ignorance(limited interaction with people who grew up predominantly black neighborhoods) which later manifest itself into an involuntary form of self hate. It's also a battlecry for white acceptance.
Nonblacks calling individual black people different than the perceived "others"(majority) is a dog whistle, on par with the saying "I'm not racist,but <insert racist rhetoric>".