It's pretty easy to think stupid things and still be a good leftist. I have kinda reactionary views on polyandry, and sometimes the way people talk about their gender or sexuality kinda annoys me( not often, but on occasion. I'mnot going into why or how because it doesn't matter, it's brainworms). I just acknowledge my opinions aren't important and aren't really leftist and just shut up. I'm a straight white cis man from a decent financial background, there is a lot of programming in me to be reactionary and, if I don't do the work to dig it all out, the least I can do is shut up and let other people do what is best for them. It's that easy.