Buddhists Talking Rough
Among the ten non-virtues is harmful speech. This vow to avoid it is implicit in refuge/bodhichitta vows; to make effort to become enlightened so that we can become capable of benefiting all living beings. Therefor it violates our Buddhist refuge vows to use harmful speech. Vows in general, are meant to help keep us from harming others and ourselves. They are not there to cramp our style.