Terence "Bud" Crawford just lost his cool on an Errol Spence supporter ... repeatedly calling the man a "bitch" and a "ho."
The fiery scene played out toward the end of the boxers' pre-fight press conference Thursday afternoon in Las Vegas ... when someone who appeared to be in Spence's camp began chirpin' at Crawford from their front-row seat.
It's unclear exactly what the agitator said ... but it ticked off Crawford, who paused everything on the stage to fire off insults at the man.
"You a bitch, n***a!" Crawford said. "F**k you talkin' to?