You didn't phrase it as a personal experience. You could have just said "not fun for me anymore". Instead, you implied the world has changed, when it could be just you.
Well, that's certainly rude. It seems you missed my point, but it also seems you're not interested in having a grownup conversation today, so I'll leave you alone.
Since you believe that there is some sort of global objective "fun" factor, I believe that this would be useful for you. https://www.superteacherworksheets.com/factopinion.html