I'm also biased as hell on this one because, even speaking as a longhair since my teens who was confused more than once for a drug user or peddler back in the day by parents of friends, I've never had a bad experience with the police other than a few officers who were curt (meh, who hasn't had at least one of THOSE days on the job?).
Seriously, not a bad experience and I always expected I'd be the first person to have that problem. Bottom line, if you're respectful to them, they're respectful to you. I've never seen a single exception to that rule.
So, with all the crap being thrown at cops lately, I have a problem with it - a big one. Now, if there's an actual example of racism or excessive force on the part of an officer, I'm all about seeing them punished and being transparent about it. What I'm NOT ok with is an officer doing their job, being legitimately put in a situation where force is required, applying said force, and then being nailed to the wall when an investigation finds that it was justified. The Michael Brown situation, in particular, really bothered me because no amount of witness testimony, forensic evidence, etc. will ever convince anyone that the officer in question acted correctly or that Brown hadn't been carrying on like a violent prick all day.
We can argue back and forth about whether that meant Brown deserved to die, but it's not really controversial that he made choices and they had consequences. He boxed above his weight and lost.
Anyway, not to veer off into politics too hard here, but I think the police are being scrutinized in a way where they can't win even when the evidence is on their side.