While it seems your co-worker is a jerk, I don't get quite so upset about the skirt comment. My training in theatre design included (unfortunatly for my GPA) several semesters of Costume History. From a costume history standpoint, a skirt is a garment without seperated legs that covers the lower part of the body. A Kilt is a pleated skirt worn by a man. I still try to say "Technically its a kilt" but really, it is technically a skirt. (And lots of societies dressed their worriers and other men in skirts, so historically, it doesn't bother me much -- its better than how the greeks dressed their atheletes -- just way too cold a way to compete!)

Cheers
Chris