Answering the original question....
Trump himself is not a relationship deal breaker, though supporting Trump could be an indication of the things that are deal breakers.
Meaning, I try to be a kind and fair individual. (I'm not going to say I succeed all the time, but I try). I'm also decently educated. Someone who is openly racist, cruel, spouting ignorant beliefs/disregarding credible experts, etc - that is probably not someone who I want to hang out with. Whether they support Trump, Biden, or the little green men on Mars is irrelevant. Someone who is these things but it's more subtle/below the surface, I'm unlikely to welcome a close relationship with, but I can be friendly and polite.
Example:
My neighbor is a Trump supporter. He's also racist. Basically, he's a hillbilly, a nutcase, etc. At the same time, he's a decent human being. He may be racist, but if there were someone passing by who needed help, he'd help out. I'm aware of all this. I'm friendly with this neighbor, but he's not going to be a close friend of mine.
My mother is a Trump supporter. She's turned anti-vax, she's prey to conspiracy theories. She's racist. And a lot of why is because she's older, her health isn't great, and she has isolated herself to such an extent that this is what happened. She's scared and uncertain about the future, and what she has chosen to cling to is not actually what's going to make anything better. But fear isn't rational. She's my mom, and I love her - but I don't discuss politics with her, and frankly our relationship has become fairly superficial. She could change that, but it's going to take some effort on her part before I'm willing to trust her.
People are complicated. A person can be a monster to some people and perfectly nice to others. This is not a contradiction, it's a reality of the complexity of human nature. Trying to put everyone into a neat box doesn't work. Trying to deny that is only going to make things worse, but accepting it isn't easy.