This is the hardest thing to un-train with new employees: be honest about your mistakes. I will not get mad about a mistake. Everyone makes them. The best thing to do is call it out so we can move to fix it. If you keep making the same mistake, maybe we have a talk about your process to see if there are any blind spots.
So many people try to hide their mistakes or reframe them as successes and please do not do that. Own it, see if you can learn anything from it, and let everyone know so we can help you fix it.
You get them after parents have already had their way with them, so yeah it's difficult for them to unlearn a lifetime's worth of instruction, to now do the correct thing.
Sigh... yeah. When all, or at least most, of society combines together to say the same exact thing, then little kids in particular tend not to question it. Fortunately some of us continue to learn even later in life.:-) Unfortunately not all of us do.:-( Even so, it's worth the effort to try to share the right way to go. Lately I've been thinking about that poem by Rudyard Kipling, "If—": "If you can keep your head when all about you Are losing theirs...":-)