Leeds sustained their fourth loss in six games and were leapfrogged by the Rams, who are now two points clear of them in the playoff places.
"In the mood that I am right now, it is better not to speak," Christiansen told reporters. "I believe all of you have seen different situations in the game.
"There was a clear penalty in the 44th minute against Aloski. And the non-penalty that was given in the second half. Against that, I feel impotent.
"It's a shame for the players that they should suffer a defeat because of only one person that took those decisions. It is difficult for me to control the situation when it is not in my hands. We didn't deserve it."
Leeds travel to Brentford on Saturday before hosting Middlesbrough at Elland Road.