Are we pretending that humans and animals do the same things? You can be fine with homosexuality, but what animals do have nothing to do with what humans do.
Yes. Everything else is only because we perceive it differently, notably culturally. And that depends on the individual, time and culture that percieves it. And our perceptions aren't always good but are built from other things including misconceptions.
It's something that happens naturally, yes. I'm not picking and choosing nature. We can decide what we want to be, including the ability to chose to not be a bigot.
Animals frequently murder those other than themselves, so then is what could be considered bigotry also natural? If this is all natural then what is the whole point of calling things natural?