Your opinions are that it's OK to casually look down on people for having political views. I think that's a legit reason for someone to think that your opinions are full of it and are worth downvoting.
Look, you have to understand that I grew up in the 80s and 90s. Having an opinion and expressing it was a big thing, back then. But, these days, it's all about conformity (or seems so, to these eyes).
For example, here's mine: In my opinion when some dude enters a conversation and calls a huge chunk of the people in it "intellectually lazy and weak", that dude is kind of an asshole, and probably thinks that he is way smarter than he actually is.