CHICAGO — With a reputation for emphasizing brains over conventional beauty, the women of the Delta Zeta sorority at Indiana's DePauw University endured the jokes and unkind nicknames: Their chapter was widely known among students as the "dog house."

"As a sorority, they had a different image on campus," says Cindy Babington, the university's dean of students. "Student culture was not kind to them."

Obsessing about looks has long been a rite of passage for young people — well before the days, nearly two decades ago, when tennis star Andre Agassi brashly proclaimed that "image is everything" in an advertising campaign.

Today, though, some worry that the fixation on outward appearance has gotten out of control — with young people's ever-increasing focus on everything from celebrity and skinny jeans to marketing themselves on MySpace, Facebook and YouTube.

The women of Delta Zeta know all about the pressure. With chapter membership dwindling, sorority leaders recently took drastic measures. They kicked out 23 members from the stately brick mansion near campus, drawing accusations that the women's weight, looks and race didn't fit the image the sorority was going for.

Sorority leaders insist that those who left weren't committed to recruiting. "It was not a beauty contest," says Casey Jolley, the chapter's interim president and one of only five members who remain at the house.

But Rachel Pappas, a DePauw junior who was among several other members who left in protest, finds that hard to believe — and calls discrimination based on image "the new racism."

"When you look at all these things and see that all of them have been eliminated, you wonder what it could be other than the image issue," Pappas says.

That the evictions happened so publicly, she adds, now provides the chance to address the larger issue — and a newfound brazenness that cultural trend-watchers say is prompting more people to freely voice their biases.

These days, "American Idol" dedicates hours of airtime to auditions in which judges openly chortle and make fun of would-be contestants' looks, style and personality quirks. Taking a cue from the grocery tabloids, entertainment magazines and TV shows now regularly pick apart celebrities' appearance and attire.

It's no wonder, one professor says, that students feel free to mock those who don't fit their image ideal.

"It's out from under the rocks. They're saying what so many people think and believe," says Thomas Cottle, an education professor at Boston University who has studied the way appearance affects public affirmation. "It's tragic."