Barrie Drewitt-Barlow

Barrie Drewitt-Barlow -- a former guest on the hit reality show "Below Deck Sailing Yacht" -- is being sued by a man who alleges he was sex trafficked by Barrie when he was just 16 years old. In the lawsuit, obtained by TMZ, the man claims he's a distant relative of Barrie's. He says Barrie…