What's the best way to handle this awkward human/dog situation?

My dog and I are regulars at our local dog park. Pretty often, one of the dogs will try to hump one of the others. This park requires a pass, and one of the requirements to get the pass is that the dog be spayed or neutered, so the humping is more a social exercise than a sexual one.

This elicits a whole range of reactions from the owners. Few seem to really not care; some are mortified, some make nervous jokes, some turn away and pretend not to notice. More often than not though, someone will try to stop it just to make the awkwardness go away.

Everything I’ve read says that humping is just a normal part of canine social interaction. Sometimes it communicates dominance, but submissive dogs will also hump. Sometimes it’s a way to stir up a play tussle. One behaviorist says that it’s a way of venting overflow excitement. All agree that it’s nothing that calls for human intervention. Getting scolded for this just confuses them.

The problem is on the human side. We have such strict social codes about acceptable human sexual behaviors that seeing this unfurls all our red flags. People in the park situation also feel like their dog kind of represents them, so its behavior somehow reflects on them. That all adds to the awkwardness.

My dog isn’t one of the obsessive humpers, but he’ll occasionally get that look, and I’ll send out a silent prayer, “Please, no” because I dread the awkward situation. What I really wish is that the humans in the bunch could just get over it and let the dogs be dogs in the dog park. The dogs that hate being humped usually make that known pretty clearly, and it all gets sorted out. But it’s way messier on the human side, and we’re not nearly as good at sorting it out.

How would you be inclined to navigate this situation?