This is very interesting. It seems that when a culture is very dominant (meaning the population is not culturally diverse), denial of and judgement on anything/anyone that’s different can increase exponentially. According to a theory I heard on NPR the other day, tradition and morality formation gives humans an evolutionary advantage in the following way. Naturally, fear is the most effective modifier of human behavior: you can’t be too risky otherwise you might die in trying new things, which is how fear protects you. However, sometimes fear is not that effective in the sense that you might miss the opportunities to try out new things such as going out with a new date or trying out new food, environment. Therefore, there’s a fine line between being too bold and being a wimp in regarding new things, which is (part of) the basis of tradition/morality. For a culture that has less diverse population, it’s not surprising that, as a whole, the attitude on people behave differently is less welcoming and more judgemental.