Finding a reason to completely disregard not just the ideas but even the humanity of huge swaths of other people is conservatism 101. Just give in to your most base tribal tendencies, and “know” that all those good-sounding ideas are in fact wrong and evil because they’re coming from the wrong/lesser people.

When you can’t argue against ideas, argue against the people saying them. See if ad-hominem attacks will work on people. (narrator: they did)