Is it rude to tell someone to grow up?

Is it rude to tell someone to grow up?

It's for someone trying to seem more mature or like they're above the other person. It's best to treat the other person how you would like to be treated. Treat them as an equal. Telling someone to “grow up” is very petty and disrespectful.

When people say you need to grow up?

By saying “grow up,” you are suggesting that you are grown up yourself and thus more qualified to judge the situation at hand. You're essentially demoting the other person to an inferior “younger” position, despite the fact that kids are cooler than adults around 70 percent of the time (which is still passing).