Someone's accusing Justin Bieber of being uncharitable -- because he gave to charity.

The 18-year-old "Boyfriend" singer has been slammed for auctioning off his pet boa constrictor, Johnson -- his date to the 2011 MTV Video Music Awards -- even though all proceeds went to his Believe charity drive.

"I found it really disgusting that celebrities like Bieber would stoop to a level of using living creatures as a fashion accessory and then so easily discard it," winning bidder Michael Kronick told E! News.

Kronick presumably wasn't too upset about it, since he, you know, bought the snake.

Bieber sold Johnson last year for about $1,000, offering the proceeds to Pencils of Promise, an organization that builds schools in the developing world and one that he sponsors through Believe.

Kronick, who owns Startifacts, a celebrity memorabilia website, donated Johnson to the Reptile & Amphibian Discovery Zoo in Owatonna, Minn., where the snake has already become a "star" after recently arriving there.

"I wanted to make sure the snake would be well taken care of for the rest of his life," Kronick explained. "I'm very pleased where Johnson now resides."

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