This should be in BS if anywhere, and no doubt will be shifted.

Homophobia is a rather weird word. Strictly speaking it means "fear of the same", since the "homo" is from a Greek root meaning "same", as in words like homogenous, or for that matter homosexual. People assume it comes from the Latin word "homo", which actually means human being, for "man" as opposed to "woman" the word is "vir".

I suppose that it could be justified on the grounds that a homophobic person might be frightened of associating too closely with people of the same sex. But it is taken as meaning aversion to homosexuals as such, which is by no means the same thing.