Sounds like deleting accounts in WP is difficult. Good to know.
Anyway.
We all regret sometimes things we say … but believe me, not many people remember/ notice what others were saying!!
Pretty much no-one does, actually, I believe.
We are all too self-centered to pay much attention to others and to remember what others said or did. (I mean, we as humans, homo sapiens, not only we as aspians) For better of worse, that's just how it is, and when it comes to regrettable stupid posts, it is for better, I think.
So, is it really that bad? Or can the situation be solved by change of avatar and display name - just to show the change to anyone who may have noticed a stupid post or two and slightly cover the identity for the rest of us who haven't noticed anything!