Baker Mayfield's wife is going OFF on fans blaming the Browns QB for Sunday's loss ... saying all the haters need to "wake up" and quit being so ungrateful.
Baker and Co. fell to 3-2 after a heartbreaking 47-42 loss to Justin Herbert and the Chargers at SoFi Stadium ... with #6 going 23-32 for 305 yards and 2 touchdowns in the effort.
Despite having an overall decent game, some fans criticized the 26-year-old signal-caller for not coming away with the dub.
Enter Mrs.