It's one dude who clearly does not give a shit about Jews, black people, hate crimes etc... But is arguing about subjective terminology used to describe the suspect. You can see from his other posts on Reddit he is a deranged Trumper who is directly biased/racist towards black people as well

Personally I think people like that are mentally unhinged and project a lot of crazy ideas they have on everyone else (ie "you are all obsessed with race not me!!"), so it's best to ignore or block them