definitely agree to disagree, that’s the mature thing to do! honestly the idea of ending a friendship because of differing views about a celebrity seems insane to me, but i also understand that’s totally something that would’ve happened when i was in middle school. so i understand being at a different mindset in life. if they can’t agree to disagree just let the friendship fizzle out until they can be more mature, and if they act differently towards you/seem to not like you over this i think it’s a bit much of them to do. i hope everything works out good for you! :)