Yeah, some "weirdo" who they couldn't, despite desperately trying to, drop, and who then in turn dropped them. THAT's what the angry douche was mad about.
(yes, I too don't like to be "raced" during my workouts. But if it's a popular running area, you expect it can happen and so you either ignore the person, start a conversation with them, drop the hammer on them [if you can and care to], let them go by, change directions, etc. It may be annoying, it may be weird at times, but people have the right to run whatever pace they want. AND.....I guarantee that every single person who complains about it, has at least once (likely a few times) done the same exact thing: been passed and picked up the pace to keep near, saw someone in the distance and picked up the pace to haul them in, tried to hang with a faster runner who went by them, in other words: "raced" someone on their workout. Everyone has done it at sometime, so people, please don't be hypocrites, despite one's rationalizations on why "when *I* did it, it was 'different'," i.e., acceptable behavior. )