I have often thought that we need a designated group to be the unoffendable objects of ethnic jokes. How about the Klingons? They're nasty, hated and fictitious. A little to esoteric? How about the Visogoths? They're barbaric, unsanitary and extinct. You say you'd like something a little more contemporary? How about Communists? They are defeated, devalued and in disarray.
Well, I guess we'll have to stick it to the traditional targets, lawyers, Rednecks and men.