There is not much you can do if you are pulled over and the officer you are dealing with is unpleasant. And I’m afraid that I am speaking from personal experience when I make that statement.
The site above at least gives one a chance to document their experience and to compare it with that of others. I wrote reviews on my interactions (both good and bad) and it made me feel somewhat better.
The Velvet Rocket 
IF YOU ARE ARRESTED OR CONFRONTED BY THE POLICE:
1. FIRST, ask to call your lawyer.
2. Be courteous; do not resist.
3. Do not consent to search or entry.
4. Do not talk about anything; do not admit OR DENY anything.
5. Ask if you are free to go. If you are, GO.