I was interested to see what you had posted that got you expelled from the blog. I think your problem is two-fold: 1) Your comments are very unclearly phrased, such that it takes the reader a long time to figure out what you are trying to say, and 2) You have commented a lot in a very short period of time.

Try putting more time into a small number of well thought-out, well-phrased comments.

Regarding 1, automating could be done so that anybody whose net karma is below a certain negative threshold (e.g., -5/-10/-20) gets their account suspended for 1 month, and next time they visit the site, there is a notification that the account was suspended and a link to a page that spells out community netiquette and norms that are expected to be adhered to. After the account is unsuspended, the individual may post again, and if they drop another 5/10/20 points in karma, the account is permanently disabled and/or deleted.

This seems more likely to result in people taking the feedback constructively and staying around as readers who may one day be able to contribute positively, as well as avoiding much of the drama that sometimes results in these kinds of situations, though I'm glad that happyseaurchin took the advice constructively in this case.

Regarding 2, we definitely do need a prominent section in the About page (and probably as part of the sign-up process) that spells out posting standards and norms that happyseaurchin violated.

P.S. I'm one of those who voted you down repeatedly in the hope that you would think about why you were being consistently downvoted and adjust your behavior accordingly, but I hope you stay around as a reader, starting with the really old material and the wiki (also, work on your grammar/writing skills). At some point, you may sign up again and participate productively.

Being polite is only essential when it can be done without causing problems. Administrative decisions are better kept in public so as to avoid confusion and aid in transparency.