I would say if you are above 1700 and have a completely lost position than you should resign.
Not true. I was playing the U2200 section in a USCF tournament, i was down 3 pawns in a lost rook endgame, i sacked my rook, my opponent took it and it was stalemate.
“No one ever won a game by resigning.” ~ GM Savielly Tartakower.
I would say if you are above 1700 and have a completely lost position than you should resign.