I think the main issue is the tone with which an idea is presented, not always the idea itself. I’m open to many viewpoints; in fact, that’s how I learn and understand best. I don’t only want to listen to people who already think like I do.
Some things can’t be compromised on, though. In my opinion, US conservatives have become blatantly bigoted, sexist, and fascist. In the past, one could give them the benefit of the doubt, but they’re not even trying to hide it anymore. I don’t care how they “present” their ideas. When someone tries to explain why tacitly supporting bigotry is okay, it doesn’t matter how eloquently they make their point. They are actively opposed to tolerance, and therefore don’t deserve it.