There might be an influx of opposing fans posting here. There might not. Either way remember they're looking to get a rise out of you.
Just ignore and realize they're the ones acting stupid. You know your hoops, you know your team, and you probably know their team better than they do. So bite the bullet, welcome them to the board, and carry on a civil conversation.
If they get out of control let the mods and myself handle things. If something catches your eye as being inappropriate than bring it to my attention. I'm here to support you guys.