Er, she did, witch.
The bovine look was because the hairdresser didn't understand what 'long enough to keep the wave, but short enough tidy it up a bit' meant, and could only work in '5 on top and 3 on the side, please'....
The clue was when the op said 'when I say this, they look at me with a bovine stare'.
I've had the same. 'Whatever you do, get rid of this big fat curl'. They look at me. I say 'I hate it, it drives me mad'. An hour later I am walking out of the salon with the big fat curl practically set in resin. Nothing short of shaving me bald will get rid of it for another six weeks.
Perhaps if the hairdresser was bold enough to say 'actually, I'm not very good at this, and I haven't really had much experience with curly hair, but shelley over there has. Let me ask her advice, or maybe you would prefer to make an appointment with her?' Instead of adopting the blank look and asking again about clippers and inches which are utterly irrelevant in terms of curls, the op might not be quite so fed up....
Or, if the extent of your skill is to make every hair on every head the exact same length, regardless of head shape, face shape, style, hair type, cow-licks, double crowns, or whatever else goes on, maybe go and find a less skilled job?