I wrote another comment about this friend that votes for a political party that would make Trump look like a liberal. Still not an issue, because we are both very peaceful people and we are not very pushy, so really even if there are differences we don't try to hurt each other over those differences and we don't take it as an insult or something of extreme gravity. Because once again, not everyone is extremely political. Even if you think they should be because the current situation mandates doe more political activism or whatever, it doesn't mean that people are..
And second big reason is the reasons she has to vote for that party. She does it mostly in spite of the socialist party to bring them down because she thinks they are corrupt thieves (and as I said in the other comment sadly it has recently been proven to be right).
Also it's important to understand that your vision of an opposite political party is not the same vision that the voters of that party have of it. In this example, and I'm sure it applies to trump as well, I think vox is a fascist political party. But she does not, she doesn't think they are fascists and of course she doesn't think of herself as a fascist (neither do I). She doesn't vote it to stablish fascism. I remember saying to her that if they get elected they will cut right for women, she just doesn't believe that's going to happen, and that's it, different believes on what's going to happen if that party gets elected.
And I'm skeptical on my own knowledge of the future as well, before the current government was elected I said that the government wouldn't do some things or some other things won't happen, and those bad things ended up happening and I was wrong about those.
I think a big part of being open minded is knowing that yourself could be wrong, and being able to understand the reasons other people have to believe they are right. Not trying to make up those reasons for my own convenience. It would be easy, and politically convenient, to say that everyone who votes for vox (or trump in that case) is a fascist, but that statement would be closed minded and, probably, radicalized. People are complex, some would vote alt-right because they are fascists, but other would not. When engaging into any kind of relationship with anyone it's good to listen to the reasons they have for the things they believe in. If a person would be a fascist I wouldn't be friends of her, but that's not the same, imho, as voting for a party that I think is fascist.