Ashtyn Zerboni says she feels she was totally vilified on "Selling the O.C." ... claiming her fellow castmembers treated her poorly, and the show itself made her look like the villain.

We caught up with the reality star on Hollywood Boulevard earlier this week ... and, we asked her how she felt she was treated on the fourth season of the show, which came out last week. She replied by accusing others on the program of bullying her. Courtesy of Netflix

Zerboni points out she was pregnant on the show and going through a lot already ... and, she didn't get any grace from her costars like she might've hoped. Plus, she adds, reality television twists and distorts everything -- in this case, making her seem like the bad guy.

As for why Ashtyn was made the villain this season, she says it's

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