Actually he's right, people can definitely be worse then Belt. The problem is too many people expect him to come out and hit 5-5 with 6 homers and 22 RBI's a game. They totally ignore the few times when he does well and 100% lock in on every failure.
Melky fails 65% of the time, Buster fails 68% of the time, the average baseball player fails 75% of the time, but even when Belt goes 1-4 he's trashed by many "fans".
Give the guy a break and learn to play the game and stop riding him like he's a flippin hall of famer.