Lovecraft was terrified of anything that was slightly different from what he was, not just race, but hometown, school you went to, social status, whatnot. It’s so extreme it really can’t be explained with ideology or psychology, something must’ve been up with him in the biological sense, like genetically shot amygdala. It’s frankly a miracle the man was functional enough to write stories but that primordial terror he felt about just about anything other is also why his stories are so good. He knows what he’s talking about.