100% with you Dave, idiots are common in every profession, either pilots, cabin crew, chefs, doctors, employees, etc..
I think a good captain should be able to recognize these elements and stop them at first sign in the most polite way, usually irony helps.
Then if after a 10hrs flight you have to divert 1000km from home in bad weather and you receive comments from a ****ty crew, everybody has his bad day..
As much as, after the same flight, and after serving 300 people for three times, you're yelled by a captain who blasts you because the frappuccino with warm milk, cacao and one and a half spoon of sugar he asked is too sweet and too hot.
But let's not forget that cabin crew has historically always been teased by flight crews since their first flight, considered just as bitchy waitresses & chicken heads.
Being a cabin attendant can be a tuff job too if you want to do it properly..
Anyway de-briefings are really important in these kind of situations, if necessary separately with the single silly cc