I also have met people from other parts of the world with unpleasant traits. The English probably take 1st place. They were moderately well behaved in England, but in Amsterdam they roamed the streets in packs of 10 or more, cursing and looking aggro. They also filled the pubs and were loud and rude and drunken. I haven't had the pleasure to meet many Moroccans though, so I can't give you a story with funny stereotypes.