Just do a replacement to find out where your arguments are bad.

I can play this game too:

• A human being did a bad thing, therefore all human beings are bad.

Swapping words out changes the argument. The argument was fine. We just start from different premises. You think all Republicans and Republican voters are racist as a premise. I find that attitude unproductive and harmful.

If I run for mayor as a progressive anti-racist candidate with an "R" next to my name, with a track record to back it up, against a literal racist Nazi, should everyone that votes for me be vilified as a racist? If not, then it seems like your line of reasoning here has a flaw.