The official seemed to miss a clear handball in the build-up to the opening goal at Old Trafford and arguably could have also sent off a Blues star
It has become part of footballing parlance that referees are only human and mistakes are to be expected, but still supporters are quick to slate officials if things do not go their way.
This was no different for Bobby Madley, who managed to anger both sets of fans during Manchester United's 2-0 win over leaders Chelsea.
The referee first missed a clear handball from United's Ander Herrera in the build-up to Marcus Rashford's opening goal.