As you admit yourself, there really are no versions of the truth. Truth is not subjective. There's objective fact, which can be established with evidence, and there's subjective opinion, which could be based on fact (or at least objective observation and reasoning) but it could also be based on fantasy and ignorance.
Trumpers do not rely on facts at all, quite the opposite. They simply deny them. They are motivated by emotion, not reason.
That is my subjective opinion, but it is based on objective observation, not emotion, fantasy or delusion. I have no dog in this fight. It's not my country. But I can't unsee what I've seen just because it sounds rude or intolerant to some people.
It's one thing to not like vaccines. I get that. I can't even get them myself since I'm immunocompromised. It's quite another thing to make up crazy conspiracy stories about Covid and to think eating bleach will cure it just because Trump said so. That's the sign of an unsound mind and yes, low intelligence and/or massive ignorance.
So while all opinions are subjective, they are not all equally well informed or well reasoned, therefore they are not all equally deserving of respect. That's why bothsidesisms are not useful as arguments. Sometimes, one side really is more moronic than the other, and this is just such a case.
Here's an article which explains the psychological
forces behind Trumpism.
https://www.politico.com/magazine/story/2016/05/donald-trump-supporters-dunning-kruger-effect-213904