Generally it is acceptable and has gone on forever. Ever heard a polish joke? I just don’t understand people whose self esteem rests on group identification instead of themselves. Folks like this are destined to always be unhappy and offended.
You have just put your finger on the reason the Left invests heavily in 'identity politics.' It is a way to manipulate and control the losers of the world by enabling them to believe their miserable state is someone else's fault.