https://www.aclu-wa.org/what-do-if-youre-stopped-police
I'm sure you can exercise your rights, but I imagine that it could get sticky. As annoying as it is, I typically try to answer their accusatory questions. But I might, just for the fun of it, take it to the extreme one day just to see what happens. Who knows, maybe I get a windfall settlement from the gov't for police brutality? Just gotta make sure someone is filming the debacle.
It's all pretty amusing. I NEVER have these sorts of interactions with State Patrol or my local city and county police officers (I am a white guy, after all). They have more important things on their minds....