Right, but you don't see the cop's whole day. Getting a snapshot of people being respectful and then concluding that the cops don't get harassed isn't logically sound. As a cop, there can be 10,000 respectful protesters, but if 100 are determined to be dickheads to you throughout the week at various times, you're being harassed, regardless of that 10,000 during that rally. And if that wasn't happening before #notallcops and BLM came around, it's easy for a cop to make the connection that these movements caused your harassment.
EDIT: Just saw your edit. Yeah. And I'm not either, so I'm just relaying what she told me.