When Heidi Klum and Seal renewed their wedding vows at an exuberant bash at a friend's house in Malibu on Saturday, the theme could have been "white trash." 

At least that's how one guest described it in an interview with UsMagazine.com The pregnant bride wore her hair in corn rows, donned a short skirt and crop top, and even had a cigarette dangling from her mouth at one point, according to the London Daily mail. 

Klum's groom reinforced the theme by wearing an American flag jacket and a mullet wig.  The "white trash" dress code was celebrated by 100 outlandishly dressed guests who witnessed the vows, which were conducted by a preacher dressed like Elvis Presley, the Daily Mail reported. 

But wait, isn't this some sort of taboo?  Why is it still PC to make fun of a huge segment of the Caucasion population that is frequently low income and under-educated? 

"There are certain groups that it's still okay to make fun of, and whites are one of these groups, whether white trash or not," says sociologist BJ Gallagher, author of "A Peacock in the Land of Penguins" and "It's Never Too Late to Be What You Might Have Been." 

"It's no longer okay to ridicule blacks or Mexicans or Jews, but all human groups have a pecking order.  We're conscious of where we stand in that pecking order and we need someone below us to kick around to help us feel better about ourselves," she says. 

Poor whites are an easy target to mock, she says "they are powerless and have no way of retaliating." 

Not that all "white trash" is without power --just look at Bill Clinton. " We still refer to him as Bubba," Gallagher says. 

"There is a connection to Arkansas, and to hillbillies.  Clinton is an example of poor white trash who rose to the top, but no one ever lets him forget where he came from." 

The fact that Americans can still mock a huge group of people without getting a slapdown is testimony to the extreme mobility of this country, Gallagher says

"People can move up through the classes but they can also fall down through the classes," Gallagher says. " We have a very open class system, but we still have a class system.  It's just that who's at the bottom changes over time." 

Klum and Seal's weekend ceremony, which marked their fourth wedding anniversary, was playful, splashy, and celeb-studded.  But, intimate it was not. 

"It's wonderful to keep celebrating their marriage but I'm not certain why they need such fanfare," Sherman says. 

"Reproclaiming their vows is very lovely, but do they have to have an almost circus-like event?  There are ways to reaffirm your love for one another in a more intimate setting, where it could be witnessed by a few people who are very close to the couple." 

Then again, if there wasn't a huge and captive audience, it wouldn't be all that much fun to get dressed up in outrageous outfits, either. 

As Seal said in the Daily Mail, "It's also a good excuse to have a big party and we have a different them every year." 

Wonder who they'll think of to make fun of on their fifth anniversary.