It doesn't really excuse the cyclist (although we've all been there in our heads if not in reality) but what the driver did was way more serious. Kicking a stationary car results in a dent, knocking someone off their bike could end up with a death.
Careless driving suggest it was an accident that should have been avoidable if the driver was paying proper attention, this was deliberate and surely should be at least dangerous driving. trouble is careless driving is so much easier to get a conviction with. The fact he already had significant points on his licence doesn't suggest he's the world's most considerate driver either.