Disick, 32, posted an Instagram photo Monday night promoting his appearance at 1OAK in Las Vegas on Friday – along with the nightclub's contest to win a round-trip flight, hotel stay, VIP seats, dinner and meet-and-greet with the Lord.
But when the father of three Tweeted out the announcement, his followers slammed him for booking the gig amid his split from Kourtney Kardashian
"You should hang out with your kids," one user responded.
"Get help before you hurt your loved ones even more," another wrote.
In the two weeks since his breakup with Kardashian, 36, after he was photographed getting cozy with another woman on vacation, Disick has canceled two club appearances at the last minute.
And his friends have expressed concern over his alleged substance abuse.
"Scott insisted that his drinking is under control, that he's not in a spiral, but everyone around him knows the truth," a source close to him told PEOPLE. "He has been lying to everyone, saying that he's clean and sober ... and he insists that he doesn't have a problem."