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 PR stuff for Golden Boy -- claims Oscar would force him to run personal, non-work related errands ... sometimes while Oscar was "highly intoxicated and under the influence of various substances."
So, when we saw Oscar at LAX over the weekend, we asked him for his response to the accusations ... and that's when the boxer swung back.
"It's all frivolous and no merit," De La Hoya said ... "No merit, whatsoever."