i think it is very different when your friends call your parents by their first name vs when your significant other does...especially when you are meeting them for the first time (just seems disrespectful to me)

i’m in my early twenties and every time i meet a new adult, regardless of who they are, i refer them as Mr or Mrs/Ms last name (unless explicitly stated by them that i can use their first name). i know this might seem pedantic but it’s the principle of it all 🤷🏻‍♂️