Chris Brown called himself a "piece of sh*t" this morning after ranting against R&B singer Kehlani ... essentially saying her suicidal episode is a P.R. stunt concocted for sympathy.
Brown -- who's friends with Kehlani's NBA star ex-boyfriend Kyrie Irving -- went off on Kehlani in the middle of the night saying, "There is no attempting suicide. Stop flexing for the gram. Doing sh*t for sympathy so them comments under your pics don't look so bad."
