want to rethink your position.
Being a jerk because you think they were being a jerk first is no reason for being a jerk (if you don't think mocking a comment made by a grandma is being a jerk then I guess we are finished here).
You are 100% not responsible for policing fans, especially fans from other teams. If you have issues feel free to bring them to the proper people who are authorized to handle them.
If this altercation had happened at BYU or an NBA game you would also be kicked out. Think about that for a second.