" Snape certainly hates the memory of James Potter and dislikes seeing Harry’s face, but for him to be able to say right away, “Amusing man, your father, wasn’t he?” shows that he expects Harry to see his point about James. He knows he is right in this assumption; Harry and Snape have seen repeatedly that they can empathize with each other’s experiences of being bullied. It "

― Lorrie Kim , Snape: A Definitive Reading