This is absolutely a thread about a thread (the one where the OP's husband leaves the table). It just got me wondering. What does your partner do because they've been brought up that way, that you think is actually really rude? And what things did you discover, as an adult, were really rude that your family thought were normal?
DP's family have no table manners whatsoever - anything I could name that someone somewhere thinks is rude, they do it. But one thing that really irritates me is that they'll let you explain what you're going to cook, then when the meal is being served, they'll say 'is there anything else - I don't like x' or 'is there something else for ChildsName to eat?' Then they fully expect you to heat up something else for them while everyone else's meal goes cold. I trained DP out of this but something minor that bugs me is that I was taught if someone comes home with the shopping, you go offer to help unpack. It's just what my mum does. DP just doesn't get this and, though it's irrational, it never fails to irritate me.
As for my family - my parents are both eye-wateringly rude in shops or any kind of situation where they're paying for a service. They barely bother with 'please' or 'thank you' and they will complain at the drop of a hat. My dad recently had me read an email he was sending to his lawyer - who he thinks is doing a good job for him - and it was so rude I was squirming! No 'I hope you are well' or anything, just a list of demands and criticisms. I was well into my 20s before I really understood how to write a polite letter.
What about you?