That’s not true either, almost every racist I run into on the internet talks mad shit about republicans for supporting Israel. Most of them wouldn’t vote for either party. I saw multiple news articles about klansmen in 2016 supporting Hillary Clinton on the grounds that she was anti desegregation when she worked on the Goldwater campaign in the 60s.
I’ve met numerous liberals and leftists that were racist in private. Hell, Che Guevara was an outspoken racist. I don’t think racism is partisan, there are just people like that out there.