I think it's best just to disconnect from this person's videos/pictures/words and anything reminding you of them. there are plenty, plenty of people in the world saying similar things and worse, and if it affects you so negatively you don't need to put yourself through it. you can't realistically do anything about all these terrible people. the only thing you can do is be a good, fair and just person yourself, and stand up for oppressed people in your own life.