From what I understand he was yelling racial epithets. Regardless to what he was spewing, breaking a glass on his head and face is unacceptable and he needs to be fired.
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AP: The troubles of the San Francisco Bay area’s transit police went viral again as video hit the Internet showing what some claim was another use of excessive force. A cell phone video showing the violent arrest of a mentally ill passenger accused of being disruptive on a commuter train came less than a year after footage of an officer fatally shooting an unarmed man incited riots in the region. The Saturday night incident has prompted claims of police brutality and sent Bay Area Rapid Transit officials scrambling to address yet another public relations nightmare.