Had a few beers thanks to Dan Air in the past.
Anyway I think back to Singapore Airlines at Taiwan who took off on the wrong runway (R instead of L)and a lot of people died.There is a lot out about runway incursions from CAA/SRG and one of the guidelines is that parallel runways should always be given their full designator.I think the controller is correct on insisting that readbacks be correct.Isn't it easier to just readback what the controller is saying than try to take short cuts.There is a fine line that sounds like being narky,but the controller is only using correct phraseology.