On the topic of bias and arguments, this article on “progressive hostility” looks compelling. I’ve only read a little of it but I’ve heard similar complaints from people I know.
As a progressive, I find this article to be depressingly accurate. And I’ll definitely admit that I’m often guilty of this, too.
But as was stated a few times already, it’s anecdotal. It lines up with your experience, with some of us others here, it doesn’t.
Which is fine. My issue is declaring it “truth” like it’s some universal constant.