One thing I have noticed among Black and Latino friends is a certain level of inurement to racist comments, just like women become inured to sexist comments.
Not that these comments are not noticed, it's just that they are so used to it that they assume all whites, males, or whomevers think that way. Some just say it out loud, that's all. So these comments aren't always a deal breaker. People look at other issues. What do they think about... guns, abortions, education, religion, taxes, immigration, etc etc etc?
A little perspective would help though.
First, some whites these days are so worried about saying the wrong thing around a black person that they get tongue tied or quiet.
Second: consider a red state white guy who's sizing up the candidates. Alternatively, he could vote for the people who want to talk about systemic racism and white privilege, but are no better, and likely weaker than his guy (republican) at getting the economy humming. Picture a white guy who grew up on a farm, can barely read, had an alcoholic father, repeated fourth grade, who has to drive a truck for $25/hour his whole life while being told he should have gone farther in life because he's got nice, white skin? There are many problems that people experience. There are many unpleasant experiences you can get from being around insensitive people. Racism is one of them. People rubbing it in that you're lucky you never had to be anything but white and male is another. And this is where, particularly coastal liberals and the media have been campaigning for republicans and still don't even know it. And I wouldn't surprised if that continues even with Trump gone (if indeed he is). And there could be a lot of people that are something like this man. It pays to be able to count.
This point has been made before but bears repeating.