Mills McCartney delivered the critical comments during her 90-minute speech to the debating society of Trinity College Dublin.
Former model Mills McCartney, 39, married the 65-year-old music legend in 2002 and gave birth to the couple's only child, Beatrice, a year later. But the couple separated last year, and McCartney filed for divorce alleging "unreasonable behavior" by his wife.
Mills McCartney said she was reluctantly obliged to befriend the world's wealthy because that was the only way to maximize her power as an agent for change.
"Sadly, you have to mix at a certain level of people to raise the level of funds you need to bring about the greater good," she said. "Because people are very snobby. These people who have lots of money, they're either snobby or they're stingy. If you have lots of money, you have to be stingy because why would you want that amount of money?"
She also compared herself to human rights crusaders down through the ages, suggesting they all had been victimized for their beliefs.
"If you look at every single person in the history of the world who has tried to make a difference, you'll find a very long section of their lives where they were treated horrifically by the government or by the media," she said.
Paul McCartney's personal wealth is estimated at $1.6 billion. British press reports have speculated that McCartney has offered his wife around $50 million, while she is seeking at least double that amount.
Paul McCartney takes Meat-Free Mondays to EU
Dec 3, 2009 8:00 am PST
Paul McCartney took his "Meat-Free Mondays" campaign to the European Parliament on Thursday, saying the power to halt global warming lies as much with individuals as with their governments. McCartney met in Brussels with Rajendra K. Pacha...
McCartney pens song for DeNiro film about widower
Dec 3, 2009 4:00 am PST
There are only so many songwriting suggestions an outsider is allowed to offer Paul McCartney. Kirk Jones, director of the new Robert DeNiro movie, "Everybody's Fine," found the limit. McCartney, who has written only a handful of songs sp...
US Library of Congress to honor Paul McCartney
Nov 16, 2009 8:00 am PST
The U.S. Library of Congress is awarding Paul McCartney its third Gershwin Prize for Popular Song. Librarian of Congress James Billington announced the prize Monday. An all-star tribute concert is planned for early 2010, though the librar...
Beyonce, Paul McCartney in Thanksgiving specials
Nov 11, 2009 12:00 pm PST
TV network ABC says Paul McCartney and Beyonce will star in back-to-back one-hour specials Thanksgiving night. The evening starts at 9 p.m. EST with a Beyonce concert that was taped over the summer in Las Vegas. That w...
Paul McCartney plans European tour in December
Oct 22, 2009 1:00 am PDT
Paul McCartney will return to Hamburg, where The Beatles honed their craft, to launch his first European tour in five years. McCartney announced Thursday he will play the German city on Dec. 2 to kick off the "Good Evening Europe" tour. ...