One thing which is frustrating in all of these kinds of things is how our stupid discourse sees racism as a binary 1,0 Racist, Not Racist kind of thing. Most of us - including me! - are a bit racist in that we sometimes unconsciously make assumptions based on race which, even if they aren't based in malice, can sometimes effectively come out in malicious ways.
I have no idea if this guy is a racist in a David Duke, or even Pat Buchanan, kinda way, but he should spend a few moments figuring out why he arrested a man for trespassing in his own house...