That's not entirely true. I've dated several very old school Jewish guys who would constantly poke fun at themselves for their specific stereotypical behavior.
And even in my community we call those "Big Dumb Magyars" who fit the bill exactly that... Showy/loudmouthed/ego-maniac/chauvenists... generally male but smaller percentage females for obvious reasons.
There are differences amongst ethicities/religions/gender etc... They should be embraced. The only time we run into trouble is when ANYONE propogates hatred.
It is my understanding that the N-word was synonymous to calling someone stupid or less intelligent and was used specifically for those descendants of Africans in the US brought here for slaves to propogating THE MYTH that someone who has darker skin color (than superior whites

) is inferior.