So we have a good campaign goin, second with this group though some of them joined mid-way through the last campaign. Though not entirely important to this question, it's a D&D 5e campaign.
That said, one of our original players, from the inception of this group, is the typical min-maxer type, which wasn't an issue until this new campaign. Now he seems to purposely derail things. The whole party agrees on a course of action, then at the last minute he goes off and gets his character into an unrelated situation, prompting the players to follow to save him, for example. The DM seems to want him gone, but doesn't want to actually confront him.
The group consists of 5 players + the DM. In my 30 + years of gaming, I've never dealt with a player like this. I understand not agreeing with other player choices and opinions, but to constantly be counter productive seems pointless. The DM sees the issue and asks me how I feel about it, but that's where it ends. Nothing is done about it, other than some post game comments I've made, as well as my character pointing it out to his. The reactions are always just a shrug.
How would you deal with a player like this?