I have always liked St. Jerome, both for the fact that he was one of the Catholic Church's first biblical scholars, but equally for the fact that he "was by nature irascible and impulsive" in his defense of the truth.  I can relate to him and to all the known irascible saints, as I am the same way.  God knows I have striven to temper my irascibility, but He knows as well that sometimes my anger does get away from me nevertheless.  However, I am not entirely convinced that irascibility, sarcasm and the like are never called for, especially in people of profound conviction and passion, such as SS. Paul, Jerome, and many notable others.