Why are some people the way they are? You know, horrible, cringey, awful, and ignorant to the extent that nothing you could ever say or do will fix any of it? Nobody knows. After all, if we knew why some people were like that then maybe we could take steps to addressing the problem and finding a solution. But alas, we do not know why some people just absolutely stink, and so the only suitable reaction we have is to facepalm. If you want to see some more of those, check out 27 Facepalms of Utter Stupidity, and r/facepalm.

Sometimes the only reasonable reaction to an extreme does of cringe is to facepalm. What else is there to do? The cringe has already happened. It is in the past. It is non retractable. You can't fix the cringe, and with how much ironic joy it's bringing you you don't really want to. So you just facepalm.