Ice Cube -- Disses Clippers ... Lakers Still Rule L.A.

He's straight outta Compton but Ice Cube is only supporting ONE team from his hometown ... the Lakers -- and taking a shot at the Clippers in the process.

Despite the fact the Clippers are about to play in a Game 7 ... and the Lakers are sitting at home ... Cube told TMZ Sports "There's only one team in L.A."

Then, for good measure, Ice throws even more shade at Lob City ... making fun of the team name.