Chris Brown Says Kehlani's Alleged Suicide Attempt Is BS -

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."

As we previously reported, Kehlani was placed on a psychiatric hold Monday after posing a threat to herself in the wake of rumors she cheated on Irving with a previous boyfriend.

For the record, Kehlani strongly DENIES cheating -- saying she and Irving were broken up when she got back with her ex.

But Brown ain't buyin' it -- trashing Kehlani in several tweets ... and saying she's basically been blackballed from NBA games.

The Internet went insane over Brown's comments -- with people coming out of the woodwork to blast the singer for being insensitive.

Brown responded by saying, "I'll be the BIGGEST PIECE OF 💩. But ima ride for my Homies regardless. KYRIE is probably one of the only good guys left. IDGAF!!!"

As for Kehlani, it's unclear if she's in the hospital -- but sources close to the singer tell us she's doing much better.