I've seen tour pros do this, with some frequency, always on putting greens, and never on a tournament course.
Here's the thing; if you know how to do it, it is not too hard to avoid any damage to the surrounding hole. And those guys know how to do it. An Anser-type putter, and partucularly one with a plumber's neck, helps. In fact, until Karsten Solheim cam out with the Anser, I hardly ever remember anyone doing it.
Query; if you're not already expert at it, how do you get to be an expert? How many cups to you get to mess up, learning how to do it? I have no good answer to that. So in the end; yeah, I'd lilke to see no one doing this. But personally, I'd yell at somebody only for damage done to a hole; not for the act itself.