Brock Purdy had a disastrous first half during the San Francisco 49ers' Week 12 showdown against the Carolina Panthers. This led to insider Grant Cohn heavily criticizing the quarterback on social media.In a tweet he shared on X, Cohn demanded that the team bench Brock Purdy after his disappointing performance in Week 12 against the Carolina Panthers."Gotta bench Brock Purdy. I don't give a f**k how much the 49ers are paying him."During the first half of Monday's game, Purdy completed 14 of 23 passes for 114 yards and a touchdown. However, he also threw three interceptions that raised questions about his skills as a quarterback.Back in May, the 49ers paid Purdy a whopping five-year $265 million contract extension. He started the season as the team's QB1. However, he missed the majority of the season due to injuries, which led to Mac Jones taking over as his replacement.Purdy made his return in Week 11 against the Arizona Cardinals. He helped the 49ers secure a 41-22 victory while completing 19 of 26 passes for 200 yards and three passing touchdowns. The quarterback's team will improve to an 8-4 record if they can secure a victory over the Panthers in Week 12.