Stoke can reflect on just one defeat in their last eight games that has helped secure mid-table comfort.
"The neutrals in the ground would think they were a couple of soft penalties," Hughes said. "I am not going to surprise you by saying I thought ours was a valid penalty and rightly given.
"My view on Cardiff's penalty is that it was very soft and the lad has looked for a movement from Steve N'Zonzi that would allow him to go down.
"I think he was always looking to go down in that situation - he drew the movement from Steven. There was very minimal, if any, contact, and it is difficult for Howard Webb when players go down in those situations.
"That was the only period in the game where Cardiff created a bit of momentum and created some opportunities for themselves.
"In the second half we were in the ascendancy from Assaidi, which if we had converted that chance it would have won the game for us."
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