Mayor Bloomberg went on the offensive yesterday against critics of Goldman Sachs, saying “ridiculous isn’t quite the right word” to describe the outsized reaction to an executive’s scathing public resignation letter that’s blazing through the financial community.

“It’s my job to support companies here in this city that bring us a tax base, that employ our people, and I’m going to do that,” Bloomberg said on his weekly WOR radio show, a day after visiting Goldman’s downtown headquarters.

Mayoral aides said 39 percent of the city’s income and business taxes are paid by the financial industry.

Goldman CEO Lloyd Blankfein told The Post via e-mail that he was “honored” by the mayor’s drop-in.

“No one understands better than Mayor Bloomberg the importance of a firm such as ours to the economy and people of New York,” Blankfein said.

Wall Street has been riveted to the drama playing out at Goldman following a New York Times op-ed piece written by Greg Smith, a London-based director who said he resigned because the firm’s culture had turned “toxic and destructive” and profits came before clients.

Bloomberg said Goldman’s clients know exactly what they’re getting into.

“I think this piling on is ridiculous,” he said. “Keep in mind that the clients tend to be corporations and financial institutions that aren’t unsophisticated. You can deal with them or not deal with them.”