Just as a writer, editor, or comment administrator can approve your commenter account, he or she can ban it. This means that your previous comments will remain on the site, but you'll be unable to make any new ones. We rarely re-approve banned commenters, so if you feel that you've learned whatever lesson there was to learn, you'd have to sign up for a new account and go through the audition process again.
Sometimes we'll give warnings before we ban—in the form of a reply to your comment, an unstarring, or a disemvoweling—and other times we won't. It depends on the situation. Often it's not even a single comment that results in a ban, but rather a pattern in the commenter's history. Each ban, disemvoweling, unstarring, or warning is treated on a case-by-case basis, but here are some frequent causes for such actions to be taken:
It's quite alright to disagree with a post, content, or opinion—but there's no reason to make it personal and leave someone crying himself to sleep at night. No one's asking you to write responses that begin with "dear sir, I beg your pardon, but my thoughts differ from yours," but there's also no need to write things like "you f-ing idiot, you're wrong."
Professing Your Love and Lust
It's fine if you profess your love and lust for gadgets, but please refrain from hitting on writers and editors. It gets uncomfortable to read about what you want to do to our sexy little bodies or about what you think we do to inanimate objects in our private time. The line between flattering, creepy, and downright scary is often far too thin.