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.

I argued with my English teacher about this exact thing. Imagine a white guy calling his black friend the n-word, and then joining an alt-right group. Snape is that creep who thinks you being nice to him is flirting. He's still creepily pining after a girl from school. This is not healthy and weird as hell. Also, Snape is responsible for Harry being an orphan. He should have the decency to have SOME guilt around that.