I've noticed patronising behaviour from casual acquaintances, but never as blatantly as those examples. I'm tempted to think they were joking, and I guess if it happened to me then I'd have laughed, and if that upset them, I'd know I'd been dealing with an elitist pig.
I once tried a similar kind of humour myself, at work. I can't remember the exact context, but I put on a snooty accent and said "well, I am senior technician." To my surprise and dismay, they took it seriously and called me out for thinking myself above them. I still don't know why they didn't see the joke.
I did get away with telling a lawn-mowing man in the USA, "Get on with your work," but he was very into taking the mickey out of British snobbery, and continued the joke by saying something very subservient. I remember feeling I was taking a bit of a risk when I made that remark to him.
My general advice for dealing with patronising behaviour is to subvert, ridicule and undermine it, as long as you don't particularly need that person's co-operation, and even if you do, it might be worth the risk.
There was a guy at work who lampooned the manager's patronising words with an impression of Igor from the Frankenstein movies and the remark "yes, master." I laughed out loud, couldn't help it. He was in a high enough position to get away with it. Technically I wasn't, but AFAIK I got away with it too. I was a valued worker, though the manager never admitted it to me. She was unusual - often condescending to your face but if she approved of you she would speak highly of you behind your back. It took me a while to find that out. My respect for her went up when I did.