i did all i could for costelus. i tried SOOO hard to work with him, including a personal phone call to him a few months back. but he can't stop whatever it is inside of him that makes him act the way he does. and frankly, i can't stand it anymore. if allowing him to act however he wants makes even 2 people leave the site, then we're going backwards. everyone on chess.com should be a positive influence on other people, not a negative one. and once somebody goes into "negative" mode where they are driving other people away, and can't turn it around after a few friendly and sincere messages, then what more can we do?
Consider temporary forum bans. If a member gets too far out of line with abusive comments, set it so that he or she cannot post in the forums for one month. Most people will reform after one ban. Repeat offenders, after perhaps three forum bans, can be ejected from the site.

What I find more distasteful is the "forum clique" here that think they are the moral ruler of all things chess.com.