I heard about this. I live right by there so I also saw the "protest" outside the Kimmel Center while the "occupation" was going on. Pathetic.
Protesting for what's right, being informed, being involved, being active, standing up for your community and fellow people- that's wonderful. That's what every young man or young woman in America should be doing. (Or not doing- a free society should also allow its citizens to not vote, not participate, not be engaged, if that's what they choose to do with their rights.)
However, anything worth doing is worth doing right. You aren't doing your cause, your group or your school any favors by making such a fool of yourself.
Edit: And protests should generally be conducted in a graceful, respectful and intelligent way.
Throwing a trash can through the window of a Starbucks to protest the violence in Iraq is unacceptable and beyond hypocritical. Carrying pictures of Chairman Mao at a pro-immigration rally is your right but a bad idea, one that does a diservice to your fellow protestors. Drinking alcohol, smoking marijuana or eating at a rally is something you may be tempted to do, given that it's a fun event with your pals, but it's not a parade, a picnic or a block party and not a good way to present yourself. And so on.