> I try not to do anything that I'd regret, and it usually works out.
Isn't this the real take-away. If you have a username that you feel is totally anonymous you might post different, or at least not give each post the same scrutiny as you do now. Do you think that you consider what you post more carefully with your username linked to your real name? Being anonymous on the internet can mean leaving some of the polite bits of you behind the keyboard.
On the other hand, who knows what people take offense to, and as careful as you are other people are still free to act in a way that would be unacceptable irl.