I'm not sure there are any unwritten social rules.
there are definitely legal ones of course. And personally I have a set of what could be called "social" rules, but they only apply to me, though I will admit to bringing to my adults child's attention, if ( very rarely) I feel they've transgressed them. Mind you, they do the same to me. So I reckon it's fair.
so mine, in no particular order (and they aren't exhaustive) are things like
• always be polite to everyone. This only applies if they are polite back. If they arent, use your discretion
• always believe you are better than no one and no one is better than you
• pay your taxes, all of them. It's the price you pay for trying to live in a civilised society
• be informed. It's your civic duty to be informed, even when it's painful,as it surely is now with the world seeming to be in such chaos.