@vagina_museum personally I don't like the term cisgender applied to me, although by the definition above, it's factual. In time perhaps I won't care.

In school I was called a nerd and it was very unpleasant. The context has aggression and bullying. Today being called a nerd is a cool thing, generally, and I don't mind. I even use it myself.

The way cis is often used now in the places I encounter it has so far been of the school bully variety; there are examples in this thread.