LordKAT, I imagine and would hope that you are being somewhat facitious with that response. Homophobia in common usage doesn't mean fear of homosexuals but a negative attitude towards them. I am guessing that this is what accord03 meant.
accord03, I can understand your confusion on this and I hope that the other comments on this thread about the difference between sex, gender and sexual orientation have helped.
From a personal viewpoint, I am biologically female and happen to find males sexually attractive. Fine so far. But I identify as male and this is where you confusion comes in, I guess. So, am I a straight woman or a gay man? I identify as the latter.
As for the possibility of transpeople being homophobic, of course they can be. We all have prejudices of some sort, even if we like to kid ourselves that we don't. However, one would hope that, with their experience of the wide varieties of the possible permutations and combinations of gender identity and the difficulty this can raise, they would be in the best position to accept, if not understand.
However, we all from different backgrounds and the beliefs instilled in us by what we hear around us can be difficult to shift. There may also be self-protective reasons why you find homosexuality offensive. Who knows.
But good for you for making an attempt to get to grips with the understandably complex situation. More power to your elbow.