Charles Barkley Disses San Antonio AGAIN -- You People Suck!!!

More shots fired in Charles Barkley's war with San Antonio ... now the ex-NBA star is calling the fans "idiots" and warning them to keep their distance or he'll "BEAT THEY ASS DOWN!"

Of course, it all started a while back when Sir Chuck blasted the women of S.A. on "Inside the NBA" -- saying the city is overloaded with great, big, hulking fat women.

When Barkley arrived in S.A. last night for the NBA Playoffs, he was greeted with chants of "Barkley Sucks" -- so he went on the air and fired back saying, "I want them to know that I hear them and I'm not just gonna take it."

Barkley continued, "THEY SUCK TOO!"

He added, "Most of the people in S.A. have been great to me and they can take a joke ... talk is never gonna hurt me, but if they get too close, I'm gonna beat 'em like a drum."

It's gets worse ... and even more awkward for the Spurs star the "Inside the NBA" team was trying to interview during the segment.