It is Haram (prohibited) for men to act effeminately and for women to act mannishly. Anyone who sees a similar thing should try to change it as much as they can. The Prophet (peace be upon him) said,
"If anyone of you sees an evil action, change it with your hand; and if you are not able to do this, then with your tongue; and if you are not able to do this, then with your heart; and that is the weakest of Faith."
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.