He was bein a bitch because he was ****ing with the speaker, and when asked to leave, wouldn't. That's when the security had to put their hands on him, when he started wigging out and making a scene.
If you wanna see a real abuse of a little authority, look up a video of police repeatedly tazing a UCLA student in the library.
Either way, these cops were just campus guards, right? That's like a step up from the security guard hanging out at your local grocery store.
Untrained, unarmed (with deadly force weapons), unexperienced, sometimes unprofessional.
I agree with CCR's summarized list.