Board Thread:Support Requests - Community Management/@comment-24155515-20140222012155/@comment-4957813-20140222012707

According to the TOU, it might fall under this:
 * Post or transmit any content that is obscene, pornographic, abusive, offensive, profane, or otherwise violates any law or right of any third party, or content that contains homophobia, ethnic slurs, religious intolerance, or encourages criminal conduct

If not, then if there is anything in your local policy that lets you ban the person, then follow it.