In my opinion, we build Disney visits up to be almost 'other worldly' absent of all the stresses of work, the toils of homelife, snakes, snails and puppy dog tails (well, maybe not the snakes...according to a few posters...few is one too many IMO but that's another thread called "Why Snakes Don't Belong in the Magical Place")
Cast Members are just regular people, walking around with a sore foot, realizing they forgot to pay the Comcast bill, feeling a little light-headed from the heat, upset because the cat has thrown up but they don't have a day off till Saturday for a vet visit, or just feeling a little pissy cause they're on their period.
This is all just real stuff. Should they feel all happy and joyous because they're in WDW for heaven's sake and don't they realize this is the HAPPY PLACE?

I guess it'd be great if they did (for their sake too) but folks are folks and life happens.
It would be great if people were overly kind and nice all the time, especially when interacting with people who have just spent over $4,000 to come be served and entertained, but I guess people let their own lives dictate their attitudes. We ran into kind folks our last trip except for two CMs who obviously didn't speak english. At all. That was annoying and unnecessary.
Quite frankly, the older I get, the more I'm seeing people acting out their irritations. Road rage was unheard of in the 60s and 70s. Not sure what is happening, but I think the whole world could use a shot of 'nice'. Just my two cents.