The Potters manager was less than impressed by the decision to dismiss the French midfielder and voiced his frustration at the performance of referee Bobby Madley
The Potters were reduced to 10 men at the beginning of the second half when Steven N’Zonzi saw red for a second bookable offence after hauling down Jozy Altidore.
But Hughes was adamant that Madley had got the call wrong and felt that cost his side the edge in a tight contest on Wearside.
“Were disappointed obviously that a performance of real character and desire and determination and no little skill has got no reward,” the Welshman told reporters after the game.
“Unfortunately on too many occasions this season we’ve been hurt by refereeing decisions that have had a marked effect on the outcome of the game and we’re talking once again about a situation that I feel was a poor decision from the referee.
“It was difficult for him because I felt the lad Altidore has gone down very easily looking for an advantage and I felt on the night too much of that was going on to be perfectly honest.
“The referee has to be able to look through that and understand what is happening and he wasn’t very good in that regard.
“As a consequence he’s bought a challenge where there is very little contact and the lad's gone down easy and the ref has deemed fit to give s a second yellow, which is unbelievable from my point of view.”