Why make it a right vs left thing at all. Can’t we just discuss things going on as they are without pigeonholing certain opinions as “right” and “left?”

I don’t think x y z thing is true because I’m “on the left.” I think it’s true because it’s my best understanding of reality, and that understanding of reality is generally described as “left.” If you falsify my arguments, point flaws in my understanding, or present me with a set of premises that corroborates reality better, I’ll align myself with that in a heartbeat. When you see something you disagree with, don’t just think “oh that’s leftism I don’t agree with that,” instead, try to figure out what you think the flaw is with it, and then offer that up in good faith. Worst case scenario, someone learns something.