That thread is what relentless prejudice looks like. I argued with people like that for a few years and got nowhere.

It doesn’t matter how much they go over the edge, it doesn’t matter how much you confront them with their prejudice they’ll never see or admit anything.

In a sense the few who admit to being racists are saner, at least they understand their own thoughts and motivations.

Also looking at that thread it occurs to me: if the too-mild-to-admit-their-racism American racists are so intransigent, imagine what Jews face in the middle east.