Queensland Cycling legislation states that...

Riding on the footpath (s288)

In Queensland, cyclists of any age are allowed to:

ride on a footpath unless prohibited by a 'NO BICYCLES' sign—you must give way to pedestrians and ride in a manner that does not inconvenience or endanger other footpath users.

Hence, pushing someone on a bike off the footpath onto the main road would be an offence (I mean pushing anyone anywhere is an offence, if we want to get down to it...)

A full run-down of the laws can be found here.

Small-minded people make me boil with anger, especially when doubled with a dose of the crazies.