Most people who refer to the "Snevans" couple do not like the "Pevans" (James and Lily) which is the canon couple.
I myself am a Snevans fan.
Harry Potter fan: True, but if Snevans happened, there'd be no Harry Potter! So James and lily HAD to be together!
Snevans fan: That's true, but Snevans was cute! i wish they could've at least been friends in the end. Wouldn't it be cool if Harry was secretly Snape's kid
Harry Potter Fan: Good twist! i suppose Snevans does rock! Snape + Lily= <3