Credit: Dimitrios Kambouris/

He's at it again!

Scott Disick is picking yet another fight: this time with one of Kim Kardashian's closest friends.

Kourtney Kardashian's beau Disick, 27, attended a Thursday event at the Green Brook Country Club in North Caldwell, NJ. A source tells that a club member introduced herself to Disick, adding that Kim's pal Jonathan Cheban was a frequent Green Brook guest.

At the mention of Spin Crowd star Cheban, Disick "went off," the source says, adding that he introduced Cheban to the Kardashians. "He was nothing before me!" Disick sniped.

The club member retorted: "We love Jonathan! Who are you?"

"It was really weird," the source continues. "Why would he be starting trouble with Jonathan when he's close friends with the girls? He's just a jerk."

Cheban is founder/CEO of Command Public Relations and co-stars with colleague Simon Huck in the reality show Spin Crowd, about their PR firm. The show airs Sundays on E! at 10:30 p.m. (EST).