Most Helpful Girl
What is the problem with that? It's criticism like any other phrase, criticism helps people became better. It doesn't mean to go to the other extreme.
Most Helpful Guy
It is indeed a daft phrase. No man needs to man up, even a sissy. It is an insult designed to make a guy feel he is lesser of a man than what the ideal man is according to societal standards.
In actuality, when verbalized, causes a detrimental effect on a guys with low self-esteem. They eventually turn violent from all the latent bitterness of feeling inadequate about themselves. So they unlesh it upon society for they feel that they need to "punish" society for doing that to them. Which is also wrong on their part.
Nonetheless for me, I personally feel kind words are the way to go. It has more convincing influence over telling someone to man up.