D.L. Hughley says Serena Williams absolutely has a point about women getting unfairly penalized for things men do all the time ... pointing to Martha Stewart as a prime example.
The comedian was strolling through LAX Sunday when our photog asked if Serena was justified in her epic outburst against an umpire overseeing her and Naomi Osaka's match Saturday at the US Open finals -- after the guy took a point away from her, and then a whole game.
She called him a thief at the time, and later said male players have said just as harsh things --- if not worse -- and are hardly reprimanded as severely as she was.