VIDEO: Kelly Bensimon's Anti-Bullying PSA

06/01/2010 AT 01:00 AM EDT

After suffering what she calls "systematic bullying" from her Real Housewives of New York City costars, Kelly Bensimon is speaking out and wants the public to know it's "never okay" to be treated that way.

"I just want to clear the air," Bensimon says at the beginning of a video posted on YouTube. "While filming the Real Housewives, there was a lot that happened but the most important thing that happened is one thing that I realized: Systematic bulling is never okay."

The reality star, 42, who recently told PEOPLE that she didn't have a nervous breakdown but rather a "nervous breakthrough" when she blew up at her costars, adds, "Four against one is never okay. Whether you're a 4-year-old or a 10-year-old or a 40-year-old woman, being bullied or ganged up on is never okay."

Her advice to those stuck in a similar situation: "Remove yourself," she says. And if you happen to witness someone getting bullied, "Help them." –Eunice Oh

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