Not often in RL, I actively try not to associate with people like that in person. On the internet though, yeah it happens more often. I sometimes engage with people like that online (on Lemmy, for instance) mostly around issues of data or fact checking. I have strong feelings about misleading or just plain wrong information, and obviously issues like that happen a lot online, especially these days.

The biggest issue is some people are very earnest in their beliefs and because of that feel justified in pushing a narrative or pushing false information to suit their viewpoint for "the greater good" and I simply cannot agree with that methodology. Others are just plain hypocrites about anything that strays from their personal views, and I cannot stand that either.