Some cops are just assholes, sorry but it's true. Maybe they don't start out that way but something about the uniform and the power can drive them to assholedom, like the One Ring did to Frodo. I can't tell you how many times I've been stopped in the street or in a park by cops asking me what I'm doing. I'm never even doing anything. So what if I stand still sometimes? How is that "acting suspicious"? One time I asked a cop what "acting suspicious" even means and he said it means whatever he wants it to mean and kind of clenched his fist. I don't talk back to them much after that because you can't tell which ones are the violent ones. Fortunately about 70% or more are good guys.