The Reds needed a response after a string of disappointing performances, but they were woeful in the first half, finding themselves lucky not to be behind.
Brighton were soon ahead after the restart, as Solly March poked home after an error by Joel Matip, and the midfielder then doubled the hosts advantage.
From then on, Liverpool remained lifeless and Danny Welbeck made it 3-0 late on, in what was arguably the most concerning, and yet predictable, result of the season.
Here we compare our player ratings with those of the Liverpool Echo, WhoScored, FotMob and the This Is Anfield readers.
This wasnt a day to focus on anything positive, on what was a treacherous afternoon on the south coast.
It was a dreadful afternoon for Matip (3.5), who got the lowest average after one of his worst showings for Liverpool.
The centre-back was awful for Marchs first goal and was walked past too often, looking like one of many players past his best.
The Echos Ian Doyle gave Matip just a three-out-of-10 rating, saying he was all over the place and terrible for the opener.
The 31-year-old played just one accurate long ball out of five attempted, according to FotMob, summing up Liverpools wastefulness.
The second-worst player was Jordan Henderson (3.9), who once again looked all at sea both on and off the ball.
In our TIA ratings, we admitted that we lost count of the number of trademark hoofed balls over the top that the captain made.
Fabinho (4.4) was considered Liverpools third-worst performer, but Doyle stuck up for the Brazilian, admitting that he wasnt helped by his teammates.
In terms of the best player, which is clutching at straws, to say the least, Ibrahima Konate (5.7) got the best overall rating.
Next up for Liverpool is Tuesdays FA Cup third round replay away to Wolves (7.45pm UK), which should be fun!