Harry confesses to his son Albus Severus that Severus Snape was the bravest man he ever knew even though while still at school , Snape had been the teacher that Harry had hated the most because of Snape 's bad behavior towards Harry . Snape was so mean to Harry because of Harry 's father , James Potter , that had bullied Snape while they were at Hogwarts . The character of Severus Snape has appeared in various animated parodies of Harry Potter .