Charles Barkley unloaded on Caitlin Clark's detractors on Wednesday night ... calling them all "petty" -- while urging them to be grateful for everything she's already brought to the WNBA.
The Hall of Famer went on the rant during a segment on "NBA on TNT" ... after trolls -- including some who actually work in the W -- expressed displeasure with all the attention the Indiana Fever star has garnered through her first month in the league.
The Round Mound of Rebound's rant lasted about a minute -- and his message was loud and clear .