However, Snape irrationally and obviously bullies him cause of reasons that the author later tries to get him sympathy for.

Oh, his mother wouldn't date you because you were a slimy little creep who publicly called her by a particularly nasty slur? How terrible for you. Seriously, fuck Snape. Anyone who thinks he's some sort of Byronic hero (and especially when it includes that he should have gotten together with Hermione) is out of their damn mind.