With Saturday's FA Cup final against Chelsea in mind the Scot made nine changes - leaving out the likes of Luis Suarez, Steven Gerrard and Craig Bellamy - but saw his team lose to Martin Skrtel's fifth-minute own goal.
"Their attitude was not right and if you get a bad attitude you are going to get a bad performance and that is what we got," he said.
"I think that is an accurate appraisal. I am culpable as well as I changed a lot of players to try to give everyone an opportunity to get in the frame for Saturday.
"I suppose by doing that it was a contributory factor to what happened but you can only be fair.
"I tried to be fair and give everyone an opportunity - maybe I was wrong.
"There were one or two positives but there were too many negatives.
"We cannot play at that tempo, we have to play at a quicker tempo than that. We deserved nothing."