First off, WHAT THE HECK SANS?
Secondly,

MY GOAT CHILD IM SO SOORRY

SO YEAH. I finished genocide. But, I didn't do it fairly. I hacked the save file and skipped the sans fight. The_Foxtronauts is really disappointed in me, but I couldn't even get past the third attack! It was the only way. I'm just sitting at a black screen now, waiting for Chara to take my soul.