I suspect that is more a Zeitgeist influence of being born into a reasonably tolerant and liberal society, rather than a "natural instinct".
Well, obviously we are not impervious to the influence of the society that we are born in, but many of us are still able to work out what is antisocial and what isn't.
Is it the case that tribes and societies were all OK with it until religion came along and tried to influence them out of this prior instinct?
I suspect that before religion 'came along', primitive people would have been biased against any kind of behaviour that was not the norm.
Religion then came along and biased people's thinking in the direction of the wishes of 'gods'.
Then science came along and caused people to think more deeply about how we got here, and with that came the realisation that we evolved from previous existing species, and that morality was a matter of controlling antisocial behaviour.
If you believe that religious morality is made-up by people who were just codifying what they already believed to be right and wrong, then the antipathy must have existed before religion.
Probably, although we shall never know for sure.