Charles Barkley is firing back at all the people 'hating' on him -- with big ol' "F**K YOU!"
Sir Chuck took over the DJ booth at the Koo Koo Room in Atlanta on Tuesday -- right in the thick of his verbal war with LeBron James -- and sent a message that seemed to be directed at the NBA star.
"This is for all you f**king haters out there," Barkley said while cueing up a song ... "For all you f**king haters, F**K Y'ALL!"
Barkley then pressed play on the Nas classic, "Hate Me Now" .