T.I. to Diddy -- PLEASE Don't Drag Me Into Nightclub Brawl

Days after being released from federal custody, rapper T.I. grabbed a mic inside an Atlanta nightclub this weekend and BEGGED Diddy to chill out ... after the mogul threatened to get violent with a man in the crowd.

It all went down at the BET Hip Hop Awards Weekend after-party at Compound nightclub -- when Diddy, a spokesman for Ciroc Vodka, spotted someone drinking a rival liquor.

Diddy began shouting at the man, "B*tch ass n**gas ... put that sh*t down ... before I come smack that purple shirt off your ass."

It appears Diddy grabs ice and throws it at the man ... before screaming, "What the f**k are you gonna do, b*tch? F**king f*ggot ass light skin n**gas get the f*ck out of my face."

That's when T.I. -- who's still on probation stemming from a gun arrest -- grabbed another microphone and pleaded with Diddy, "I done paid enough time ... and nobody else in this motherf**ker [who is] talking about fighting done did no time."

He then told Diddy, "Let them n**gas drink what the f**k they want man."

He added, "I love you n**ga ... you know I will go to war with you, but come on man ... let's go."