It would appear to have to do with the fans from the other side. Or are you too blind to notice?
I think you would defend your team if so many derogatory remarks were made against it. Why shouldn't I defend my team, and why should other Steeler fans not defend their team? Steeler fans are loyal and many. They do not call us the "Steeler Nation" for nothing.
Get a clue. If you can't find one, try to buy one.
You won the Super Bowl. Why do you have to "defend" anything?