An actual saying I heard early on and that I am still fond of though is: “if you point your finger to someone else, three fingers are pointing your way”
My old grandpa said donkeys years ago. Respect your elders - but if they are rude, give them hell - they have had years to learn to be a bstard. And they will play on it.
My Dad said these quite often: “If you can’t say anything nice don’t say anything at all” “Getting bored is for boring people” (to combat the endless “I’m booooored” kids often do) “If you keep making that face the wind will change and you’ll be stuck like that” (usually said during kids make stupid/ugly faces XD)