Season four of Bravo's reality series "Vanderpump Rules" is back, and cast mates Scheana Shay and Katie Maloney dished about the drama fans can expect since Stassi Schroeder has returned to the cast, Entertainment Tonight reported. Now Schroeder, Maloney and Shay's former co-worker at "The Real Housewives of Beverly Hills" star Lisa Vanderpump's SUR restaurant, has responded to their comments via social media.

"Post Traumatic Stassi Disorder... It's an epidemic," Schroeder wrote on Twitter, along with a link to Shay and Maloney's joint interview with Entertainment Tonight.

"When we all found out that she was returning, we were like why, so confused and suspicious about the timing because she so publicly trashed all of us and the show," Maloney said in the video interview. "The fact that she was now crawling back, we're all like [laughs], 'We're not gonna make this easy on you.'"

It was when Shay was discussing drama with her best friend Ariana Madix. Last season, Madix was offended that Shay would allow Kristen Doute to attend Shay's birthday party, since Doute is the ex-girlfriend of Madix's current boyfriend Tom Sandoval.

Madix questioned Shay's loyalty as a friend after she refused to kick Doute out of her party, and Maloney said the situation gave her flashbacks to a similar situation she had with Schroeder and coined the term PTSD: Post-Traumatic Stassi Disorder.

"'But because I have a problem with them and I'm your best friend so should you,'" Maloney said, mocking Schroeder. "And I'm like 'That's not my cross to bear, you're gonna have to get over it.' It really is like so weird déjà vu."

See Schroeder's tweet and watch Maloney and Shay's interview below.

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