Here’s a truism: Donald Trump, the TV billionaire who is about as genuine as Thurston Howell III, cannot be shamed into anything.

Last week, I wrote a column about the Hope Community Services of New Rochelle’s efforts to feed the hungry, which is a challenging task even in good times. But now that we’re in a recession the likes of which have not been seen in generations, donations are really scarce.

Carole Troum, Hope’s executive director, told me that donations of food and money have dropped 30 percent in the past six months.

Way back in June, Hope wrote a letter to Trump asking for help. And why not? He’s always bragging about rich he is…and he made a pile of dough building a 40-story monstrosity in the middle of the Queen City of the Sound. If only for the sake of good will, he could part with at least a few bucks to help out a worthwhile cause in the same town.

But nope. The Trump Organization didn’t even have the class to respond to Hope…not until I called them last week. Then they said, oh yeah, they had an answer and you know what?—it had just gone out in the mail.

Today, Troum called me to say a card from Trump had just arrived in the mail. Trump’s answer was “no.” Big surprise.

“It’s a pre-printed card; it’s not even signed,” Troum said. “It says, “We have limited funds available for contributions which prevents us from responding to a great number of worthwhile causes.”

What a guy.

By the way, contributions to Hope can be made by calling, 914-636-4010 or by writing to Hope Community Services, Inc., 50 Washington Ave. New Rochelle, N.Y. 10801.