Oscar De La Hoya is calling BS on an L.A. radio star who claims the boxing legend treated him like crap during his run with Golden Boy Promotions ... telling TMZ Sports his lawsuit is full of lies.
Oscar just broke his silence on the lawsuit filed by David Gonzalez -- famously known as "Tattoo" -- who accused De La Hoya of doing some seriously messed up stuff in his role as head of the company.
In his suit, Gonzalez -- who was hired to do announcing and P.