Holy crap that is just about the dumbest remark ever! Was the professor a jerk? Yeah, it looks that way. I think he had a huge chip on his shoulder. (Maybe he heard about slavery, segregation, black voter suppression and KKK lynchings?) Did the cop over react, yeah it looks that way. It's mighty hard to justify arresting a man on his own porch for poor behavior.
Do black get harassed more often than whites? Hell yes! Have you ever heard of the crime of driving while black?
Anyone that believes that cops reacts the same no matter the race of the contact person is simply not paying attention,or is purposely obtuse.