I also believe that upper-middle-class white males will have much more success in exercising that right than members of other societal groups will.
I also believe that upper-middle-class white males will have much more success in exercising that right than members of other societal groups will.
There is overwhelming evidence that women are treated more leniently, not men. Here is one example: http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2144002
"...large gender gaps favoring women throughout the sentence length distribution (averaging over 60%), conditional on arrest offense, criminal history, and other pre-charge observables. Female arrestees are also significantly likelier to avoid charges and convictions entirely, and twice as likely to avoid incarceration if convicted."
With that said, I agree that it is important to distinguish the practical consequences of exercising your rights from their philosophical consequences, though: while you should be able to behave in a lawful manner to police officers without fear of reprisal, it is important to realise that you probably can't.
Personally my money is on upper-middle-class old ladies.
Maybe I have a legal right to do so, but I'll never be doing it again.
I believe it is important to understand that having a right, but choosing not to exercise it is a philosophically different scenario than not having the right in the first place.