The rude 'nows' can't tolerate questions, they hang up, so no idea what motivates them. They unfriendly, don't bother to explain or apologise, say please or thank you, just wanty wanty. I suspect they're rude in any situation, and can barely string two words together. Easy to anger.
Most city types apologise nicely for the late notice and explain they had a cancelled meeting and have a spare hour before their next meeting. They pack all their meetings into one day for their monthly trip to London. Might as well fill a dead hour with a bit of mentertainment.