Openly flaunting one`s sins implies disrespect towards Allah and His Messenger, and the righteous believers, and is a type of stubborn provocation. Concealing sin protects one against being disrespectful in this manner, because sin brings humiliation upon the people who commit it.

It is prohibited for men to imitate women and vice versa with regard to clothing that is unique to one’s sex, and the one who does that is subject to the threat of being cursed. So, if it is prohibited with regard to clothing, then imitating women in one’s movements and tone of voice is even more abhorrent.