a jenner
A Jenner is when you like more than one team in the same sport, and you're just being a total nerd about it. You cheer for both and don't care who wins.
I'm a Jenner. I like both teams. I don't care who wins.
He's a Jenner. He roots for both teams and never picks a side.
She's a Jenner. She likes both teams, and I respect that.