dog park drama

The dog park always leaves me feeling like a horribly unqualified dog owner. Maybe this is because my dog spends a good twenty minutes of each visit trying to hump the various other dogs that he is engaged in play with. I would not mind the humping if he allowed the other dogs a proper go, but he is highly hypocritical when his turn comes to be on the receiving end.
I spent our time there shouting things at him that made the other dog owners giggle behind my back. "Do you not understand that I am leading by example?" I asked. "I do not hump the other dogs in this park, so you should not hump them either!" I threw a tennis ball in an effort to distract him and, thankfully, it worked. "I do not know what I should do," I confessed to one of the other owners. "He seems to have found something he is good at and is sticking with it. I just don't know that it is the kind of hobby I can lend my support to."
The dog happily returned with the ball in his mouth and dropped it at my feet. Unfortunately, before I could even bend down to pick it up, he was at it again. The brindle boxer, whom my dog was so enthusiastically showing his moves to, stood their proudly, seemingly oblivious to the attention my dog was lavishing upon his back end. "Dog," I pled. "Please!"
"Do not worry," the boxer's owner reassured me, patting my shoulder. "Chev is just too slow. It is really his own fault."
While I appreciate her concern for me, I cannot see how what she says could possibly be the truth. Whenever I have been subjected to unwanted/unwarranted humping, never have I thought "If only I had been faster!"