The all-black movement remains a suggestion, not a rule. There’s nothing to stop anyone from wearing whatever color they damn well please to the Globes. But with so many A-list celebs on board, the pressure’s on.
That being said, lots of male participants may not even notice a difference. The classic black tux has always been a red-carpet staple. Protest or no, it was always a safe bet that tons of dudes would show up in black.
Still, it’s nice of these guys to put on a show of support, we guess. That is, as long as this isn’t just a show of support.