Alexis Mac Allister's dramatic 99th minute penalty to seal a 1-0 win was also a huge step towards European qualification for Brighton.
And Italian boss De Zerbi, who was initially a doubt for the game due to illness, made sure his side celebrated in the dressing room after the game.
He clapped along and waved his hand in the air while a member of his backroom staff danced away.
However, some United fans poked fun at the Seagulls after seeing Sky Sports air the celebrations.
Supporters pointed out that Erik ten Hag's side had come out on top when the two sides faced off at Wembley just days ago - in what most would argue was the bigger game.
One joked in response to the dressing room scenes: "Celebrating like they’ve made it to the FA cup final."
Another said: "It’s like they won a semi final or something!!!"
A third added: "We're their cup final shame they couldn't do it when it really mattered at Wembley."
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