> This is patently untrue

No it isn't. The border wall is an idea rooted in racism. Look at Trump's nonsense about rapists and murderers. The immigration ban is a policy rooted in racism. Look at Trump's nonsense about Muslims cheering during 9/11. Do you notice a pattern how support for these policies go hand-in-hand with racist comments? That's because these policies are inspired by the idea that white people are superior to non-white people. It's not hard to tie Republican economic and domestic policies to racism either if you're willing to go one step below the surface.

> Regardless, many people are registered as Republicans who abhor racism and bigotry.

Then they need to stop supporting it. Voting for racists or for people who stand by while racist policies are enacted is equivalent to supporting racism. This is simply calling a spade a spade. Republican policies are racist and supporting Republicans means supporting racism.