Charles Barkley just threw all of his support behind the LGBTQ+ community and Bud Light while out in Lake Tahoe this week ... telling the haters to piss off during a powerful speech at a local bar.

While up on stage during a break in the action at the American Century Celebrity golf tournament ... the NBA legend grabbed a microphone and took aim at transphobes, homophobes and critics of Bud Light.

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"I want y'all to drink this f***ing beer," he said. "I want y'all to drink this f***ing beer. I got three cases of Bud Light."

"Hey," he added, "And I want to say this -- if you're gay, bless you. If you're transgender, bless you. And, if you have a problem with that, f*** you!"

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