system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can people passionately hate entire races?

I find it so puzzling, and the answer has to be much more complex than simply ignorance, right?
gpt
Humans at their deepest psychological roots are tribal animals. For hundreds of thousands of years we have been evolving within some of the harshest environments and competing for resources against (you guessed it) other tribes. Now going past a simple and often misguided sense of race as something strictly biological; there is more symbolism and culture to it then meets the eye. ANY group that differs from another group (be it skin color, clothes, background, culture, religion) will automatically and subconsciously create an in-group/out-group situation. "They aren't like us at all, so they must be a threat to us and our resources" - That's what your subconscious, namely your amygdala is screaming to your prefrontal cortex. This is why even sports teams and military branches get so competitive and antagonistic towards each other (pseudo-tribalism). So how does "racism" happen: through nature and nurture. There is already a latent psychological predisposition towards hating strangers and others, now, get born into a family, society, religion or culture where "authorities" practice prejudice and discrimination = full blown hatred of other races. Trump and his advisors and strategists played on this to get elected (and it worked). And naturally if you feel unworthy or insecure you will scapegoat and hate almost anybody with different markings.