Sorry for the dupe threads on this subject, but it's important to neutralize this troll ASAP. Please don't feed him anymore and do the following:
If you go to this troll's profile and hit Add to Ignore List, you won't see his posts or messages. His profile will be deleted and his IP address will be blocked shortly, I'm sure.
If you go to this troll's profile and hit Add to Ignore List, you won't see his posts or messages. His profile will be deleted and his IP address will be blocked shortly, I'm sure.