I don't blame her either. I can imagine she did get tired of them yapping.
It's not a racial thing either. I've personally bashed a kid - white kid - and his father got all bent out of shape. Parents are going to protect their children. That's normal.
Sometimes, we think we're are just heckling or dissing a player or coach and forget that person is more than just a player or coach to somebody else. That's their son, sibling, father and so on. People often say that they can say whatever they want because they bought a ticket. If you feel that way, don't be surprised when somebody else who just may be closer to the team than you are gets offended and defensive.
Sometimes it's best to just apologize and keep your mouth shut.