Loving the thread!
Parents' evenings arethe most draining part of the job, only because they are so full on and relentless and you want to give every one of them the best.
Had 82 sets of parents queuing to speak to me between 4.30 and 7.30 recently. (that is one sore dry throat!). I love them, though.
Vast majority of parents are fab, but have had the following:
'What age are you?' Er, 31? (not even v young looking!) 
'And so, can I ask, (after long, tricky to negotiate conversation about student who was being both lazy and disruptive), why is he in a class with other people who aren't like him? Don't you think they are causing him to get in trouble? His friend is in the higher set and says it's nothing like that.'
She meant 'not white, middle class' as a lot of the others where Somali and Nigerian. Fucking hell. When pointed out that we set on ability, and not any other 'factor' etc she asked 'Hmm. And how long have you been teaching? What are your qualifications?' and...
...wait for it...took out a notebook!!!'