Republicans hate their own children more than they love their country; they'll burn the latter down, for a chance to regain control of the former.
They hate themselves, and just don’t do well identifying that emotion. So it’s transferred to others—projection.
A certain kind of person, often raised in an abusive environment, cannot tolerate in their offspring, traits that they were taught were weak or childish or immoral. Traits that they might share to some extent or fear they share or saw those who shared those traits treated badly.
My personal observation is that for the most part, people who are confident and happy with themselves tend to be more comfortable with and accepting of people who are ‘different’ from them.
People who spew hatred are not happy people.
I take it a step further: that people don't really hate those different from them, but rather those who are similar to them but whose mechanism of coping was self-acceptance rather than aelf-rejection.
Whole humans could potentially choose ANYTHING to ground their rejection, as you imply, usually it is related to exactly what of themselves they seek to reject, because there is this inking even in my own mind that direct opposition is the surest way, if there's any way at all to reject it "of the self" (there's not).
It could break either way for many, I think, and part of the goal of the modern church is to make it blossom into self-hate and hate of all those who reject the anti-christianity of the modern "church".