I don't have to use a dog park, we have a perfectly good park behind my house, a bare block of nothing that the dogs can run around with a ball and have the place to themselves. I like to go mainly for socialization for myself, being around like minded people who enjoy the company of dogs - much like this forum but talking to an actual person. It's when newbies come along when things like this take place. With the 30 odd regulars who use the park during the week, no trouble takes place.
We all usually congregate together so when we see the usual "big dog pen" users in the little dog pen we know shit is going down. This guy shouldn't be proud of the fact he got a park all to himself, i would feel embarrassed that i look like a shit dog owner who can't control their dog.