AS previously stated by others, I do think that a degree of patience is required with low hours students, indeed all pilots - ATC is a profession after all.
What really gets my goat is poor instruction. I've just had an example of it.
Low hours student with instructor on board calls for start and readability. This I give him along with runway and pressure - no readback, what's the bl**dy instructor doing?
He then calls for taxi stepping all over another guys airways clearance readback - what's the bl**dy instructor doing? AND NO APOLOGY EITHER - bad manners on top of poor airmanship too.
Yet again, no read back of taxi instructions or pressure - what's the bl**dy instructor doing?
Ready for departure and he doesn't read back the take-off clearance, just starts to roll - what the bl**dy hell is the bl**dy instructor doing?