Bad situational awareness, at best. Once you put on a uniform with Rutgers on it, you are representing the school. If the mascot didn't know what was happening, you'd hope a "handler" of some type would get a hold of him/her and put a stop to it. Hopefully it never happens again.
Way back when, I was part of our pep band on a game at West Point. After the game we were playing "Loyal Sons". Many Rutgers fans kept on walking by; the cadets in our area stopped dead in their tracks and waited until we finished playing. RESPECT. They must've thought it was our Alma Mater. I was honored by the respect they showed our school. We should do the same, particularly for the academies.
I played in the band at Navy in 1998 when we won a dramatic, close one. Even back then I remember the doofuses who got dorked out by things like formation marching, spinning rifles, and the singing of an Alma mater. IT'S A FOOTBALL GAME. Sure, be respectful, and take it super seriously if you want to. But some people....don't care. It means nothing. It's a show. Ceremony. Ritual. Should the mascot have stood quietly? Yeah, probably. But who honesty gives a frack? Grow up.