The show began filming last week -- and sources tell TMZ, when Courtney's husband Doug Hutchison introduced himself to TheDirty.com's Nik Richie ... Richie refused to shake his hand.
According to sources, Richie then called the guy a "child molester" and refused to say another word to him.
We're told Doug was deeply offended by the remark and has been extremely upset since. The standoff has created a rift among the cast.
FYI -- Doug married Courtney in Vegas last year ... when she was just 16. Courtney's mother had to sign a consent form permitting the marriage because Courtney was under 18 at the time.