I agree that it's generally the RAAus folk who talk more than others.
I'm intrigued to know: If you were sitting in the PIC seat of an RPT aircraft full of passengers, back tracking (because you have no choice but to) on a runway on which you've just landed, feeling under pressure from a light aircraft on approach to land on that runway, would you really remain mute when the lighty calls short final and you're not clear of the runway? Would you characterise a call addressed to the lighty, merely stating the fact that the runway remains occupied and continuation of the approach and landing would be dangerous and unlawful, as "a crack" at the lighty? What do you reckon your passengers would expect you to do in the circumstances? Just remain mute because you don't want to upset old mate in the lighty?