I'm guessing most animal behaviorists have priorities other than watching who is fucking whom. Unless we're talking long-term bonding pairs, which are much easier to observe, but those are not the norm in the animal kingdom.
I don't know that I would say that normalizing heterosexual behavior when it shouldn't be normalized is homophobia. Misguided, bad science, poor bias, I would say any of that. But I don't think you can credibly say that all of those scientists who just aren't noticing homosexual mating practices are bigots.