How to know if someone if living under a rock

Person 1 : It's my first time at a con! So excited!

Person 2 : I've been two 12 of these.

Person 1: woah! That's cool! I love anime like oh my gadddddd..

Person 2 : *starts humming theme song of pokemon*

Person 1 : what are you humming?

Me : ..... triggered