Ex-NBA star Stephen Jackson just unloaded on Austin Rivers ... calling him "trash" and a "scrub" for comments he made about Bronny James.
Rivers recently gave his take on LeBron's dream of playing alongside his son in the NBA ... revealing he hopes it doesn't happen, as it could do more harm than good for a young hooper still developing his skills on the court.
Rivers compared the situation to playing for his father, Doc, during his time with the L.