Yes, it's harmless and great fun to some.
But I don't want to be in the back when some idiot decides he's an airshow pilot.
Not what I paid for and it's not what he's supposed to do, take me from A to B with no fuss in the safest manner possible.
As a professional Pilot myself the idea of 'showing off' in such a manner is abhorrent.
These people are idiots.