While knowledge is part of it, understanding is also a large factor. Having to explain things again and again and them not understanding what you're saying.
I would say some regular culprits are viral internet memes that say something crazy. My SO and I are ideologically aligned, for the most part, so are both right-wing. I don't know if you spend time in right-wing internet silos but there are a lot of [redacted] memes that go around claiming something wild that are almost always false. Maybe it's the same on the left, I have no idea.
Used to, I would explain what's going on, which I'm fine with. At a certain point, she became tired of the explaining and decided that I "never agree with her." So, now I have to ignore them, because I'd rather not fight about it.
Contrary to others here, I am not a fan of Porkbun. Yes, it has everything you need and yes, it is cheap. But the website is sub-usable way more often than it should be. I started using Porkbun because it was so cheap and I've found myself going back to IWantMyName.com. It's more expensive but I think I get a better experience and service.