And yet, in places like NYC, the complaint from many activists is the opposite - that poor people get arrested more because its the poorer areas with more policing.
A simple example in NYC is turnstile jumping. The people willing to risk a ticket/police engagement over a $2.90 fare are likely not high income. Yes you do see it even in higher income areas but not at nearly the same rate. Ride a train that goes through rich and poor neighborhoods and spend 10 minutes at the turnstiles of each.. the disparity is huge.
Some argue it's unfair that people have to pay the fare and it should just be free. To me it seems like moving the goalposts on what we consider crime. There's already programs for reduced fairs for students, elderly, and low income. There's plenty of other examples of this behavior.