I normally don't promote posting "institutional drama" on public forums, but there are several exceptions, and this is one of them. It isn't great that these students were rowdy at a school-sponsored event, but it happens every now and then with younger students.
What's much more alarming is the blatant denigration and assault of the bar staff. That is not excusable - anytime, or anywhere. What's more, the fact that this was a repeat occurrence suggests this isn't an isolated incident, but a pattern promoted by that class's culture (if not the culture of the institution more broadly).
There are factors outside of a school's resources, opportunities, and location that can and should be discussed when suggesting others to apply or matriculate. This is a clear example of one.