We're flying between the runways at a desert location practicing. We're flying our patterns at ~50ft agl. On downwind we're passing a 130 on approach, I don't remember how close we were, but it was apparently closer than comfy for the 130 landing. I hear "Dude, not cool! Tower, we almost just hit a helo." Tower responds "that helo wasn't anywhere near you." 130: "we'll talk about it later." Good on the 130 AC for not yammering on tower freq. On the other hand, well I guess the 130 types aren't used to the separation we helo types are used to. In all honesty, he probably didn't see us at all until he said that, and it startled him. Still, my whole crew had a good laugh.