The problem is simple really. Fans got upset their star went to the rival. Instead of keeping quiet or thanking the fans or anything he went the complete opposite and took shots at the fans. They went from being upset he left to being insulted. Add in lots of alcohol and clear thinking isn't exactly the most likely result.
Joe Flacco Super Bowl 47 Champion and MVP
Joe Flacco First Rookie QB to win 2 games in his first playoff.