I'd say 'and I think you need to remember you are a John with a chip on his shoulder'
That should do it.
That's a good one, or something along the lines of;
"I'm so sorry but don't cater to misogynistic bellends, you clearly don't deserve the time of a prossie/hooker for being such a moron with your extremely poor social skills & immature outlook on sex workers"
These types get off on debasing us, it's all a nasty little power trip to get up your nose & he's succeeded. Try to laugh it off & see it as it is just a total nob with a stupid attitude. There's always a nicer "normal" client around the corner.