Robbie Brady's 22nd minute penalty proved the difference between the sides during a fractious fixture on Saturday afternoon.
Hull played over an hour with 10 men after Ivory Coast striker Yannick Sagbo was sent off for an alleged headbutt, but Norwich failed to cash in, despite dominating the second period.
Speaking about the incident afterwards, Hughton believes Norwich had an equally bigger claim for a penalty moments after when Turner himself appeared to be pushed in the Hull box by Curtis Davies.
Hughton said: "I thought it was an incredibly soft penalty. I think most of us would have seen a bigger claim at the other end. If you are going to give the one against Michael Turner then you have to give the one on Turner.
"The lad (Sagbo) was never going to get to the ball, it was going over his head. There was contact but you see that in every game. It was incredibly soft.
"The game turns on an incident which is incredibly soft to give. I never thought for one moment it was going to be a penalty."
Reflecting on the match as a whole, Hughton admitted his side were well below their best, although he believes they did do enough to get at least a point from East Yorkshire.
He added: "We've come up against a very resilient Hull team, they made it difficult for us but we needed to show more quality in the final third and with our final ball.
"We gave away possession far too easily at times which allowed us not to get into a rhythm in the first half.
"It's a missed opportunity. Apart from the penalty John (Ruddy) hasn't had a save to make, which for the period when they had 10 men is understandable. If it's a 0-0 scoreline then you come away happier and at least you've got something out of the game. We certainly didn't deserve to get nothing out of the game."