Galactoasty
Someone who is a god in online games when they are alone, but turns into a babbling idiot when friends join. Also kind of sounds like galaxy toast with a y.
I had 100% accuracy. Then my friends came. Now I miss every shot.
I was the king of the game. Now I’m the guy who can’t even aim.
I used to be good. Then my friends showed up. Now I’m just bad.