I agree with you - Stereotypes are just that - part truth part humor(exaggeration). Problem is, people have learned to stop laughing and use PC as a means to seem more cultured and refined.
Again, let me fess up a definition:
Political Correctness is a doctrine fostered by a delusional, illogical liberal minority, and rabidly promoted by an unscrupulous media, which holds that it is entirely possible to pick up a turd by the clean end.
Really, every race and culture has stereotypes - OMFG - what if they dressed up like nerds??? Honestly, something needs to change with this society.