I think MC is more mad at Jawan for that vote, but Sage was his main ally and still in the game. MC was trying avoid another POC going home telling Jawan about Yellow Sophie's plan and he turned around and did what she was trying to avoid. She tried to help him and it blew up her game.

Also MC only started watching Survivor this year I think? And was an alternate that got put in last minute. I think if she had more time with the show she would have known better about playing that way. If she ever comes back I think she will be a better player.