Stoke are now without an away Premier League win in nine matches, with Hughes admitting concern at the Potters' record on the road.
"It was a low-quality game from both sides I would suggest, there wasn't a lot of guile and creativity shown," he told Sky Sports.
"We didn't have enough creativity in that final third to cause them enough problems of note.
"And that's where we are at the moment, we're okay at the back and into midfield, but then we get to a point where we find it difficult to create those clear-cut chances.
"So it's disappointing that we were unable to really build a performance that would enable us to take the game away from Palace.
"We've been talking about our away form and we really felt this was a game we could win, but we gave away that goal and after that it was always going to be difficult."
Pledging to sharpen up his side's defending, Hughes conceded Stoke had allowed Jason Puncheon far too easy a path to the winning finish.
"We're better than that, and we can't allow consecutive errors to happen in Premier League games, because inevitably they lead to goals," he said.
"That allowed the lad to shoot in the six-yard box, and they scored the winning goal.
"Those frailties in our defence need to be worked on and that's something we'll address."