I disagree. The police don't consistently arrest people for committing minor infractions. For example, spitting on the sidewalk is a violation in NYC, but the NYPD isn't issuing thousands of summonses. It doesn't make any point re: the police and race.
This guy is a professional agitator. He didn't get arrested for carrying graffiti tools, so he tagged city hall. The officer present decided to not deal with a political speech issue and moved along. Then he decided to be a smart ass and annoy people who have the power and broad discretion to apply the letter of the law upon him. When you do that, you tend to attract harsh treatment.
The second part isn't a problem per se -- the District Attorney's office and Probation Department are legally invested to use their own discretion. I suppose that if he built a rapport with the PO and had his requests granted, that he would be complaining that he received favorable treatment for being white.