Look, I'm just a random no name poster who rarely speaks and mostly observes. You and catbone were the first two that popped into my mind when I read that description. So, imo you could do a couple of things to remedy the issue.
1. Maybe do some self reflection on your posting style, the things you say, and how you present your feelings so you're not one of the first individuals that come to mind when someone mentions negative posters.
Or 2: Don't take the internet and random message board strangers too seriously. I recommend number 2.
Have a good Sunday!