People in general don't teach any type of table manners anymore and I hate it. I usually don't get worked up about what others choose to do but poor table manners are a pet peeve of mine. My husband is even worse than I am in that regard.
I think it was around the mid-90s when cereal commercials all showed kids eating with the spoon fisted in their hand like a damn gorilla. Our kids aren't fit to dine with the Queen of England or anything but they could absolutely hold their own in most any other situation.
They learn at around 3 HOW to cut with a knife and if their little butter knife doodads can't actually cut through the meat we'll do it for them. Around 5 or so is when they get steak knives and do it themselves although the youngest (7) still struggles a bit with her little spaghetti arms.