City slumped 2-0 to a struggling Pompey side and Hughes - who has seen his team win only once on their travels in the Premier League this season - admits he was left more than unimpressed.
Hughes - backed by the finances of billionaire club owners the Abu Dhabi United Group - has previously pushed that his squad is a work in progress and has been keen to point to any signs of progress.
But following the weekend setback at Fratton Park, where Pompey were playing their first game since the departure of sacked manager Tony Adams, the City boss could not hide his disappointment.
"I was angry," Hughes told Key 103.
"We work really hard all week to give the players information and an understanding of the game plan. But on Saturday that had not been taken on board.
"If you veer away from what you are trying to do, then you will be exposed.
"We didn't get anything like a performance on Saturday and in the end, we got what we deserved, which was nothing."