Uppity: An uppity person behaves in an unpleasant way because they think that they are more important than they really are.
Not sure what you're point is as it's obvious what the definition of the word is. The point being made by croesy is that it was used (and is still used to this day) against black people who didn't "know their place" in society and shouldn't act a certain way... Like they're second class citizens. So it's the connotations of the word that's important here.
https://www.dictionary.com/browse/connotation