Ice Cube has a serious bone to pick with the NBA and Adam Silver ... saying the league talks a good game about equality, but when it comes to supporting a black-owned company --like Cube's BIG3 -- they've completely dropped the ball.
The rap legend and 3-on-3 league founder teed off on the commish while he was on Tucker Carlson's Twitter show ... calling out Silver for making it seem like the league is at the forefront of change -- when, in his opinion, it's not doing much at all.
He said, "The NBA is full of great slogans and they write 'Black Lives Matter' on the court and they do all those things, but pretty full of s*** when the rubber meets the road."
Cube believes promoting the BIG3 would be a layup for the Association to show they're really about the cause ... but instead, their grand gestures have resulted in no real action.
"I'm just saying it's easy for them to put that on the court. It takes a little more effort to really care to work with a league like the BIG3. You really gotta want to make a difference."
Cube has been in an ongoing feud with Silver ... claiming there are several NBA team owners who want to get involved in the BIG3, but the league won't let them.
He's even openly said "I don’t give a f**k about working with the NBA" ... but wants the league to quit trying to keep his organization from growing.
Silver has yet to address Cube's gripe, but don't expect 'em to grab beers together -- not after this chat with Tucker.