Most gay people I know don't mind much when people assume that someone is straight, but most people I know would be at least slightly offended if someone called them "abnormal." I get your point, but the word "normal" has normative connotations to most people, it's not just a statistical description. The opposite of "normal" to most people is "weird."

I read through your comments to find a random fact about you as an example. You've been to England. Most people in the US haven't been. Does that mean that going to England is abnormal? No. That's a poor use of the word. Is it a statistical aberration? No. It happens consistently, but aberration is not the word for it. Is it less common than not going to England? Yes. Should you watch every word you say when talking about travel so as not to exclude anyone who has been to England? Hell no. But, at the same time, if I (who have not been to England) was always making statements that worked under the presumption that nobody had been to England, you might correct me, as might your friends who knew you had gone.

Of course it's different when it's going to England, which gives positive status, and homosexuality, which has been historically considered a bad thing, and which people have been killed over.

The thing I hate about PC is that people shouldn't hide their ignorance, because then nobody will ever know to teach them why they're wrong.