Always seems to be referring to men because they did something stupid-(not smart) having nothing to do with maturity. It is manly use by women referring to there husbands."You are so damn immature."
or "He is the most immature person I've ever met."
Always seems to be referring to men because they did something stupid-(not smart) having nothing to do with maturity. It is 
manly use by women referring to there husbands."You are so damn immature."
or "He is the most immature person I've ever met."