I completely understand where you are coming from, and see it in my own posts from 20 years ago.
But I think we need to remember that as humans, we're meant to grow and change and the fact that you can look back and pinpoint why you acted the way you did says a lot about you. You're self-aware and have the ability to recognize your own past flaws - a trait I don't think many people have.
I spent a lot of time on this forum 20 years ago. I was a kid, brash and eager to stand out from the crowd. I can without doubt say that's not at all who I am now.
Is it cringeworthy? Yes. But it's also a good reminder of how far I (we) have come.