Kicking a dog is a very, very bad idea, even small dogs can cause alot of damage very quickly.
That depends on how far you manage to kick em.
FWIW My German Shepard Dog was often attacked by little dogs with the owners shouting " You should have that thing on a leash" whilst Sabor stood there quite placid. Larger dogs were never a problem for the lad, sometimes there'd be a bit of 'banter' between them but never anything serious and a couple of 'stop' words (Sabor's was Oi COME HEEEERE) always stopped any damage.
The thing is with GSD's is that they don't need a lot of 'exercise' but they do need 'companionship' and attention, if left alone for long periods they quickly get bored and can be quite destructive (shoes, carpets and doors being favourites) as they are a Wolf hybrid they are very social animals and detest isolation, they also have a trait that tells them not to attack smaller 'pack' members making them an ideal family dog ( with the right owner who understands their nature and their needs)