Acting like a man has nothing to do with not screaming in pain. Watch some gym fail videos and you’ll see people who can bench 6x as much as you screaming in pain as they try to get a lift up or something.

“Man up” by not worrying about what other people are thinking of you and try your ass off to lift that heavy object. Even if it involves maybe making a fool out of yourself, or asking for a spot, or giving yourself a way to not die when you fail your 1rm