The players were praised by Thomas Frank after the win.
The Community Stadium was the site of the Bees' third win in a row in the premier league.
Frank and his players celebrated with their supporters at the end of the game.
It was a great night. Frank told the British Broadcasting Corporation that the players are incredible.
The attitude, effort, hard work and togetherness are what they put together to win.
The opening goal was scored by Ibrahima Konate after he took a corner and put it in his own net.
Yoane Wissa made it 2-0 after both of the goals were ruled out for being in the wrong place at the right time.
Alex Oxlade-Chamberlain got one back for the Reds after the break, then Bryan Mbeumo scored a third for the hosts late in the game, after Darwin Nunez's goal was ruled out for being in an ineligible position.
It's crazy. If you want to beat them, you have to be at least 200%. Wissa hoped the fans liked it.
We worked well together. The reason we did this was because we played together. We have to be humble because we know how the league works.
I could have scored a couple of goals. I got one after I scored twice, but I was in the wrong place at the right time. Everyone is having a good time.
Ivan Toney picked up a knee injury in the win over West Ham and was unable to play.
Mbeumo said it was an "unbelievable feeling" It was a big win against the Reds. The 3-3 result last season made us want to do more.
One of the things that made us score a lot of goals was the fact that we always went for it.
The team has lost one of their nine games at home this season.
The Community Stadium's results include a win over Manchester United in August, a goalless draw with the Blues in October and a 2-2 draw with Spurs in December.
They have never lost a game in which they have opened the scoring in the premier league, and they beat Manchester City in November.
Frank said it was impressive that we beat Manchester City away, drew with Spurs when we should have won, and beat West Ham.
We've tried to do the same thing. They work very hard and want to go that extra yard for each other.
It's amazing to be in the top seven. The run of games we've been through is very impressive.
We need to celebrate and enjoy the moment, but then we need to be at our best to beat West Ham in the FA Cup.