Smith says Steve Bruce's men didn't 'work' for their goals.
Speaking after the game, Smith said: "I just think when we were 1-0 up, we just stopped playing. I think they pressed us differently.
“It was us stopping playing and them changing their tactics slightly, with the mistakes there comes more pressure and the crowd get involved. From there, it's just a scruffy game.
“It's not even like they've worked for their goals. It's frustrating."