Pot, Kettle

The whole "pot calling the kettle black" thing would kinda fit here, except that it's too racist given the context.

As I walked home from the other day, I passed a well-dressed black man on the street outside one of the newly-constructed buildings on the block. He was yelling something in a very thick West African accent.

"Go back to Guatemala or Salvador or wherever!" he yelled, "You don't talk me like that!"

It was a little ironic that the guy with the thick African accent -- presumably, therefore, not born in this country -- was telling someone else who (presumably) was not born in this country to "go home."

I guess the height of assimilation would be when you feel comfortable enough to tell others to "go home," huh?