I'd be pissed too if a cop treated my wife that way. It's hard to say if there was bias involved because of your wife's accent or anything like that. Maybe, maybe not, because some cops are so easily triggered by any perceived pushback from the person they just stopped and detained for allegedly breaking a law with no victim. It's a great example of a profession that attracts a certain type of person; a person with a need to control and feel in power.