"I suggest that you call people you know in Thailand, find out what's actually going on and stop defending child rapists," the billionaire wrote to a reporter.
The boys thanked the rescuers for all their efforts and vowed to live life to the full following their "miracle" escape.
Three of the boys and their coach are stateless, meaning they don't belong to any country and have restricted rights.
Hospital Director Chaiwetch Thanapaisal said at a news conference that "everyone is strong in mind and heart."
The boys have been trapped for more than two weeks in a flooded cave complex.
Over 100 emergency workers struggled on Tuesday to rescue an injured man trapped after a rock fall in a 3280 foot-deep cave