A phrase for someone who is being rude? [closed]

I'd probably say, "[Please] show [some] respect." To me, "Know your place" is somewhat old-fashioned and has connotations of a master – servant relationship or of a class-bound society.

Sometimes a humorous rebuke (such as "I wish I were your age and knew everything") is more effective than a solemn one, but it depends on the person and the occasion.

You can always use, with any person who is being rude to just about anyone;

"You can catch more flies with honey than with vinegar".

He/She might even learn something from it :) .

But its not specifically to what you asked for.

https://www.dictionary.com/browse/you-can-catch-more-flies-with-honey-than-with-vinegar