What's funny is that in my experience, these denigrating terms came from each system's users, not from "the opposing tribe."
At my school we used the TRS-80, and constantly bemoaned its (many) faults, and dreamed of having Apple IIs ... and then one time we went to a computer show and met some kids from another school which used Apple IIs—who told us how much they hated their Crapples and how they wished they had TRS-80s... ><
It is funny to read how quickly a news.ycombinator discussion degenerates when talking about Google, Microsoft or Apple.