Fabian Hurzeler's decision to take off Carlos Baleba in the 81st minute at Craven Cottage last week was greeted with boos from the Brighton supporters.
It did not help the German manager's cause when Fulham found a 92nd-minute winner to leave the Seagulls with just one win in 10 league outings.
There was a sense of deja vu on Saturday as Brighton were denied more points in a late 1-1 draw with Everton.
And more boos rang out at the Amex Stadium at the final whistle as Beto snatched a certain victory from Hurzeler's grasp in the seventh minute of added time.
Brighton had looked determined to turn things around against the Toffees and made a strong start.
Pascal Gross and Danny Welbeck went close to an opener in quick succession inside three minutes, before Welbeck had a header from a Maxim De Cuyper corner sail off target.
However, after Kaoru Mitoma went agonisingly close to a breakthrough in the 18th minute, both teams cancelled each other out for the remainder of the half.
The second half began with persistent pressure from the Toffees, but Germany midfielder Gross's first goal since rejoining the club from Borussia Dortmund would have come as a relief for his compatriot Hurzeler.
His first Premier League goal since a penalty against Tottenham in February 2024 came just when it felt like Everton were having a foothold in the game.
But the visiting side's late reply means the Seagulls are now winless in their past five games, with pressure mounting on their manager.
