GP post uses personal experience, but fails to understand that being white is a crucial detail. "Police are racist" isn't persuasively countered by "I'm white. They treat me okay". This is a point GP has made before. "Them black fellas would be fine if they weren't so uppity" is, not surprisingly, a touchy viewpoint.
(PaulHaugis does make some good points about lynchmods and bullying and it's weird that those posts get so heavily downvoted.)