Standards of formality change over time. That doesn't mean, however, that people should reject current standards.
Neither should they slavishly cling to them. If one doesn't reject outmoded standards, then how can they change over time?
The wearing of a necktie is an outmoded throwback to when lack of heating required keeping your neck warm. It is now merely a stupid anachronism, a strip of colored cloth without purpose beyond decoration. Strip it off and throw it away, Man! You have nothing to lose but your noose! Clothing revolution now! No comfort, no peace!!!