Back when I was in Australia we did a few demonstrations outdoors, and I agree that the movement is somewhat different.
Oddly enough, we had fewer hecklers than the few times the Flinders University club practiced outside on university grounds.
Practice anywhere that is visible to the public often requires special concentration and patience. Or a willingness to "deal with" the situation. (I am reminded of karate practice held in a school gym last year, when some kids decided to mock our instructor - something they won't ever be doing again in a hurry!)
As I've said on other forums, every dojo should have its own kydo branch or at least some of Heckler and Koch
's fine products to deal with hecklers.