Even if it was in their nature I would see no problem with hating them. I hate mosquitoes too and they also only follow their nature. I can hate whatever I want for the reasons I deem fit, everything becomes moral in the moment you deem it as moral and everything becomes immoral in the moment you deem it as immoral. When I say slavery/etc. is moral it then becomes moral in that moment for me as an individual. Why should I restrict myself in my own feelings when these feelings offer me improvements of my own life quality? Why should I pose restrictions for myself when nobody else restricts themselves for me? You can make any judgement you want, but in the end everything you say falls apart after a single "No, I see that differently!" The question is not whether we should hate someone, the question is "Why not?"
Furthermore, just because something in nature it doesn't mean that we have to accept it, in nature incest/rape/necrophilia/infanticide and everything else occurs, but these behaviors cannot be tolerated within the limits of a civilized society, if we say the behavior of some people is normal because it occurs in nature we can say it for everything. Nature isn't something inherently good or bad, it's inherently neutral and with law/force/etc. we try to subjugate it, if it came to nature we would still shit in caves and die after a minor injury due to infections, flying to the moon or transplantating hearts is highly unnatural. Nature isn't something to accept, it's something to subjugate.
