This is one that parents tend to use on their children during fits of frustration, but it’s language that every mom, dad, and guardian should eliminate from their response library.
People are complicated beings affected by zillions of influences. We all mess up, and sometimes we all need a little babying, regardless of age.
From a socio-psychological standpoint, many things that happened to us as children affect us as adults. So avoid flinging the “grow up” sentiment at people. It’s dismissive, and using it will make you a hypocrite.