With the way our government works, it’s really hard to not vote for candidates that you don’t have at least some problems with. With the way presentational elections seem to be going, you end up having to choose which one is less bad. And in FPTP, voting for a third party is basically useless.
And not every GOP candidate is a bigot. I’m sure most, if not all of them, genuinely wish for the country to be better (same thing applies for any politician). It’s just that disagreement over how to make the country better had devolved into name calling, which is a terrible way to get people to change their opinions.
I don’t change my opinion because someone calls me a bigot. I’ll change my opinion if they can show me how my view is flawed, and why their view is better.