To insult one black person is to insult them all, why?

I am a white man who grew up a middle-class life in the suburbs in the southeastern US. Areas I have lived in were always predominantly white middle-to-upper class with some racial/ethnic diversity. Areas were low crime and family-oriented.

There is a contrast difference between rural, poor whites versus those who grew up with more class. There are different social and economic classes for white people.

Just as with white people, the same exists for black people. You have morally-sound, well-rounded black people. Many of them can be my best friend or like family. Then, you have the ghettoish, uppity, entitled, and unhinged blacks.

Just because I don't want uppity, ghettoish, and temperamental black people infiltrating my community doesn't mean I am "racist".

There seems to be this mentality that only white people can be racist. This is very untrue and a dangerous mentality to have.

To insult one black person is to insult them all, why?
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