To me if Robin acts this way it kind of makes Bruce look like a bad parent.
Does Bruce beat the shit out of criminals? Yes. But I like to think he hands out well deserved ass whuppings and that he doesn't try to gouge peoples eyes out or stab them in the dick. He's fair. He gives them the beating they deserve and sends them to jail...he doesn't enjoy maiming people IMO.
I'd read that in this story Bruce has started 'going all the way' which is why Grayson left. More Batfleck than comic Batman. But it could also be a red herring.