This kind of sadly has been the most effective. Previously when I did this he'd re-litigate this over slack and in meetings again and again, trying to prove this was a bad decision. He's stopped doing that after my manager told him to knock it off.
I say "sadly" since this is basically pulling rank, which I don't want to have to do. But I don't think he'll leave -- he seems really entrenched in, having worked on the team for a lot longer, and seeming to enjoy it anyway.
It's also hard to ignore in team meetings without things being tense and awkward. I can easily come across as "the bad guy". And the last lead was a lot more willing to lay down the law like that -- the team completely fell apart and everyone tried to get each other fired, and it just took a single quarter for that lead to leave.
It's all risky and high-stakes, since I do really value my position and enjoy it (except for this) -- I can easily turn into the bad guy.