Humiliating. DENVER — Here are the 49ers’ grades for their humiliating 11-10 loss to the Denver Broncos. GAROPPOLO: F. The 49ers seemed so happy last week to have Jimmy Garoppolo return as their starting quarterback. Are they happy now? Tonight, Garoppolo played like he usually plays — like a backup. He had happy feet in the pocket, and no weight transfer or velocity on his throws, which is why so many of his passes sank and died. Plus he made some of the worst decisions you’ll ever see. Garoppolo finished this game with 211 passing yards, one touchdown pass, one…