Tribal mentality. A lot of people conform to the 'Hate them... not you though, you're one of ours' mindset.

"Fucking hate poofs. Not Barry though, he grew up around here, he's alright."

"We should shoot all the [insert racist bollocks here]. Not Abdul who runs the corner shop though, he calls me 'boss' when I go in."

Etc. If only their sense of tribe extended a bit further.