I knew this claim was BS, the moment I read it:
This is partly due to the nature of the jobs in San Diego. These include a high proportion in the service sector. The cost of living in San Diego is also pretty high, with the city being the 4th most expensive city in the nation.
San Diego is
far from the 4th most expensive in the US! San Diego isn't even the 4th most expensive in California!
From
Cost of Living Index for Selected U.S. Cities, the following are all more expensive than San Diego:
Boston, MA
Fairbanks, AK
Framingham-Natick, MA
Honolulu, HI
Juneau, AK
Los Angeles-Long Beach, CA
Nassau County, NY
New York City (Brooklyn, Manhattan, Queens)
Oakland, CA
Orange County, CA
San Francisco, CA
San Jose, CA
Tamford, CN
Truckee-Nevada County, CA
Washington-Arlington-Alexandria, DC-VA
I could name several medium-sized SF Bay Area cities not on this list that probably are more expensive than San Diego. Do she pulled that factoid from her nether regions!