The problem here is two-fold.
The first is Mr Mellor being inexcusably rude and pompous, and the second is the taxi driver recording the conversation and selling it to The Sun.
Obviously Mr Mellor was angry, and rude, but these sort of incidents happen in London cabs every day - it's simply that the nation has access to this one in all its rather ugly detail to consider and discuss, instead of the majority which are forgotten moments later.
I heard a selection of London cabbies on the radio, all of whom seem to have picked up Mr Mellor as a fare, and they all agreed that he tends to know which route he wants to take, and directs the cabbie accordingly, and that most times, he is perfectly affable.
One drive put forward the interesting concept that cabbie / passenger conversations are private, and should not be revealed, and that the driver, once identified, will be ostracised for his actions.
We shall see - but of the two, it is Mr Mellor who does not emerge covered in glory on this occasion.