Jurgen Klopp says the defensive approach Manchester United adopted at Anfield in Saturday's goalless draw would perhaps not be tolerated at Liverpool.
Liverpool possessed more of an attacking threat in the encounter on Saturday afternoon, but failed to convert their dominance into goals.
The result means Liverpool have won just once in their last eight matches in all competitions, while the seven-point gap in the Premier League between them and United remains.
When asked by Sky Sports whether he was frustrated with Jose Mourinho's setup, Klopp said: "It's not my right to be frustrated.
"I'm sure if we would play like this then we could not do it at Liverpool, but obviously in Manchester it's OK. I don't judge this, it's all OK.
"We have to think about our performance, our situation and it's not worse. Yes, we wanted to win, 100 percent. We were working for it. All the subs were quite offensive. There were a lot of brilliant individual performances in a really difficult game.
"But again, sometimes to open it you need a bit of luck. First of all, you need to continue working really hard and then, at one point, it will happen."
Klopp believes Liverpool's display should have been enough to see them pick up victory, while adding that he felt United would be entirely satisfied with a draw.
"The performance was worth three points," he added. "We were the better side, the more active side. I think Man United came here and wanted a point. They got it and we wanted three points.
"Everybody knows it's quite difficult when a top-class team like Man United has that defensive approach. You will not have 20 chances, but we had enough clear [chances].
"I'm happy about big parts of the performance. I said to the boys after the game: 'We've already decided to take hard way when we joined Liverpool, so we have the hard way.' Let's carry on.
"So far we have only lost one Premier League game. It's not exactly what we wanted but obviously everybody could see we're not miles away from Man United, even when they have a few more points.
"When we [next] play against them maybe they probably can't play this style again and maybe we have more gaps to use."
Joel Matip had the best chance of the game in the first half, only to see his low effort denied by a quick-reaction save from David De Gea.
The centre-half admits he was taken aback to see the goalkeeper produce a save from close range, but rued his missed opportunity to potentially win the game.
"It was a great save from De Gea," Matip said. "We had some opportunities, like my one -- I have to score and then maybe we win this game. I was a little bit surprised. I have to score, but his reaction was brilliant.
"We had a lot of possession and created one or two chances. I think we had more of the game, but it doesn't matter. That's the result and it's OK. We can live with this."