Technically you're getting off lucky. Here's what you agreed to when signing up for the site:
"The User is prohibited from posting any unlawful, obscene, libelous, defamatory, threatening, or other material that would violate any law or generally be considered to be offensive, via the Service using the chat option, the player images option or in correspondence with PokerStars' staff."
"Without prejudice to any other rights, if a User breaches in whole or in part any provision contained herein, PokerStars reserves the right to take such action as it sees fit, including terminating this Agreement, immediately blocking access to the Service to such User, terminating such User's account with PokerStars, seizing all monies held in the relevant PokerStars account and/or taking legal action against such User."
Meaning that technically by making that unarguably obscene and offensive comment, you have breached the agreement and they have the right to seize your funds. Most likely you'll just receive a chat ban though.