The point guard added 13 points during the 113-95 loss, leaving the team bottom in the Central Division.
The 24-year-old told reporters: "It is really tough. They are a great team so to be down by 20 at half time it is very tough against a team that makes a lot of threes and moves the ball well.
"Definitely no effort. It seemed like we weren't ready to play from the jump. On the road you can't be like that. You have to have more energy than the home team.
"We are all NBA players in here so I feel like if we have a problem with the defense, we just have to make adjustments on the fly or in the game. Teams are going to make shots and three pointers but we can't get down and it seems like we just get a little frustrated."
The Warriors face the Oklahoma City Thunder tomorrow.