JIMMY Floyd Hasselbaink was left frustrated by the mistakes that cost his team at Ipswich and meant they failed to build on Tuesday's impressive win against Bolton.
The Brewers were behind in the first minute to a Kayden Jackson strike and although they created opportunities had a mountain to climb after Ipswich doubled the lead through Wes Burns and then added a third from Bersant Celina.
The Albion manager said: "It was pathetic really. We spoke about it at length, what their triggers are and right from the start we opened their trigger. That is very naive, very silly and it makes it very difficult.
"After the goal we were in the game, we had one cleared off the line and Conor Shaugnessy should score but overall we played like schoolboys today and when you come to these places, especially this place, you have to man up and play the game properly.
"Even if we don't get the goal back, we must stay in the game, keep it at 1-0, as in the last 10 minutes it can open up.
"They are a good side, it's a big club and we are Burton but we are still disappointed. We can come here and lose but I don't like the manner of how we have lost. That should have been a lot better.
"We didn't create in the second half and we were forced to change system and personnel. We played too many back passes and that's what they want so they can squeeze you.
"It's frustrating after Tuesday and that's something for me to think about. We spoke about why Tuesday was so good and we didn't do those things today. When you come here you have to earn the right to play and we didn't do that.
Oumar Niasse came on in the second half to make his Brewers debut.
Hasselbaink said: "The game was dead when he came on so it was about getting minutes and familiar with the game so we can't judge him today."