Sounds like a great dog and good owner
There was this pro dog trainer always in the park walking her two sheppards. These dogs marched together in order. Told her once she should wear a shirt that said she was a trainer. She was losing great advertising.
The point is stupid people (or not animal smarts) see a dog off a leash and they assume an automatic that their little poochie is as good as yours. Of course they are but come on.
Maybe you could put a little shirt on your dog that says- Mommy trained me well.