After fighting back from a goal down to lead 2-1, the Reds leveled via a Mohamed Salah penalty.
Ten Hag said: "Very mixed emotions.
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"On one side I am disappointed that we have dropped seven points in one week after being in winning positions, but we have to blame ourselves for making stupid mistakes.
"On the other side I am very proud.
"You see how we are improving and the potential of this squad is amazing - I am proud.
"In decisive areas we were losing battles especially with young players we were not confident to win them (duels).
"We encouraged in the second half to do better and they stepped up."
On their confidence, he added: "It's two things.
"One thing is physical after Thursday, a big intense game, and then return from London dealing with the frustration. On the other side is the belief that you can win such duels."