When somebody only sees the bad in everything (leaving out the positives). This person would be "shit-sighted."; Someone who is unable to find the silver lining even if it him them in the face;
Female: my god domenic, would you look how beautiful this winter is? i love all this snow, its so pret--
Male: I FUCKING hate it, bitch, it's cold as fuck!!
Female: fuck dom, you're so shit-sighted!