We should always encourage anyone involved in our sport, male or female, to be true to themselves. If a boy feels comfortable being 'fierce', flipping their hair or doing motions usually considered more 'feminine', then good on them.
I also don't think 'fierceness' and college success are mutually exclusive. There's one high-profile team in particular this year which is famous for its crossovers from a college team. Their boys absolutely KILL their dance and motions, where some of the moves involve a bit of hair-flipping and general sassiness. And they cheer for one of the most successful college programs in history.
You're entitled to your opinions, though.