do you find it funny when you see?

Question

a real young kid (like not real young though, maybe 7th or 8th grade) wearing an ac/dc or led zepplin shirt and then you ask "whats your favorite song by "name of band on shirt" and they cant tell you a single song by them? one time i saw a kid in a rolling stones shirt and asked his favorite song by them and he said stairway to heaven....i had to laugh a little at him. what would you do?