When I read about making them wear a "tattle tail" the first thing that came to mind was the Scarlett letter.
I don't think it is a mean thing to do, but not necessary. You would then have to always have them with you and be ready for them to wear them in public.
I would have just told him if he doesn't stop acting like that then he wouldn't be going to the park at all. I'm glad it gave you and dh comic relief when you needed it. That was probably the most useful they will be, lol.
sahm to 3 little women and 1 little man who keep me extremely busy and take all of my time away from here!
I have LOTS of toys to sell....My Little Pony, Fisher Price ramp & speedway, Littlest Pet Shop, you name it I probably have it! PM me!