Not a big deal IMO. Obviously, we don't want judges with biases but that's almost impossible to completely prevent, he was just a facebook fan he didn't know the dude personally.
Also, judges aren't objective, they can try as much as they want to ignore their biases but they will always play a factor in deciding who won the fight, some people's biases will shine through more the others. Also, some may think they are objective when in all reality they are biased without even knowing it. Hell people develop ideas about a person they see just based on seeing them, or what other people say.