Likely you are right about parents financing in this case as Rochester is a huge college town. I note one white guy in the video has more intelligence he gets up high and tries to calm them down saying something  like "no! don't throw stuff! no!" A girl is saying something to leaving customers like "you don't have to run, we're not going to hurt you! we're just here to stop your party". Those are the ones still in charge of their faculties, trying to do something with a bit of logic and purpose.

But the video really is an excellent illustration of the formation stages of a mob! You see some getting excited by the power of being able to frighten people, and others who follow them who seem in a reluctant stage but are slowly letting go of their inhibitions and joining in. It really is how things like lynchings happen. Luckily in this case the fever must have broke before things got too bad or we'd be reading about much more serious consequences.

Not worse but not over, it's obviously becoming a popular thing to do and right wingers are eating it up. Your parents are right to be a little paranoid about protests: