I know, it's something we should do, I always made DC do it when they were young.
But AIBU to think that, IRL it doesn't actually happen?
I eat out frequently, with everyone from business contacts, colleagues, friends and family. People from all sorts of cultures. Not once has anyone excused themselves to wash their hands before eating.
Colleagues will eat lunch at their desks. No one goes to wash their hands first.
When I have people to eat at mine, no one goes to wash their hands when invited to the table.
Wedding or party buffets, no one is going off to wash their hands once the buffet opens.
Etc etc.