Well, my USA family back in the 1800's would have supported the KKK - they were ardent supporters of the south, strong Democrats who to this day hate Lincoln, and probably would have been at home with segregation and the like.
Yes, you could find Proud Boys pictures (I don't even know who they are...) but go to any campus, almost to any protests and you will see angry people, raging about things they invented themselves. Did you know that Global Freezing is caused by Capitalism, coporativism, America and greed? That was the late '70's after the rage of Vietnam was over. And did know that Global Warming is caused by Capitalism, coporativism, America and greed? Woman not having their own sports? That's a rage too - and now, woman wanting to freeze 'trans' men from taking over their sport? That's a rage too.
There's nothing proud about the American left. They hate tradition, history, private ownership, Capitalism, nationalism, police, business, the flag, the family, children.... and this is where the bulk of hate comes from in American politics. The rest is just reaction...