Outdated "manners" you'd like to see go away

Agree on one. I never understood why putting your elbows on the dinner table was rude and always found the concept silly.

What peeves me most about two is that men are always expected to hold the door open for women and it should just be a general gesture. If someone is behind me, I hold the door open for them regardless. I often get funny looks for doing it, but it’s a courtesy thing in my opinion. However, it’s not something I expect or anything like that because, like you said, it’s a door!