Fraser came off the bench to score in the 3-1 victory at Vitality Stadium.
Asked if he was surprised at being left out, Fraser said: "I just get on with it to be honest, it's football.
"You just try and keep your attitude right and try and bounce back. If I've done that then I've done that, if I haven't then I'll try again.
"It's not me that picks the team. It's his decision to make.
"You're obviously disappointed not to play the game and I didn't expect it, but at the same time it happens and I'm a big boy, so I get on with it and just try and take it the right way."