Honestly, they're just having fun. They have a long history of being like this - if their performances are not hurting anyone, why not let them continue? It's a good laugh and they're just kids blowing off some steam and having fun. There are enough college marching bands trying to appear more than they are and do corps-style shows - it's literally just band. As someone currently in one of the biggest, most recognized, most popular, and most historical college marching bands in the United States, I can tell you that a lot of the hype and the 'tradition' comes from being rowdy in our own unique way - and not many people in the band want it to be more than just fun.
In short - It's. Just. Band. Don't make it out to be more than it is. Corps is corps (I march both in a drum corps and in college band), and band is band. Let them be their own thing. It's just band.