It's the line of thinking I mean. It's not always a big leap to apply the logic of shunning certain behaviours to shunning certain people, especially when you blame said behaviours on particular races. For example, stealing is bad -> "black people steal a lot" -> black people are bad is an easy chain to make, especially if someone who is already racist comes along and wants to manipulate others to join them.

A substantial majority of people didn't want to be around Jews or black people for very similar reasons at certain points in history. They felt they had a duty to "shun" them for being different.

See where this thinking brings you? Once someone gets to decide who is right and who is degenerate, that's when society becomes unbearable for innocent people.

Yes and yes