There's a lot to unpack from the video below. First, Dennis Rodman is either part of, or interrupting, a "jazz band" performing at the W hotel in Hollywood. Second, Dennis Rodman antagonizes the crowd about Kobe Bryant, repeatedly saying "fuck him" for unspecified reasons.
Kobe and D-Rod (let's get rid of the Worm and start using D-Rod) played together in the lockout-shortened season of 1998-1999. Rodman started 23 uneventful games for the Lakers that year. It's unclear why Rodman went nuts on Kobe like this—except that he is Dennis Rodman—but back when Rodman was visiting Kim Jong Un, Kobe went on the Jimmy Kimmel Show and sort of made light of the whole situation.
Actually it's probably just that it's Dennis Rodman.