>grandpa is 95 years old >was in a British tank batallion

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>grandpa is 95 years old
>was in a British tank batallion during WWII
>was stationed in Europe several times during the conflict
>was always a role model for me, and a tough guy to heart
>go visit him the other day at his beach house
>brought my laptop with Girls und Panzer on it
>thought he would think it fun that old tanks from his time are now used in popular culture
>tell him I have something to show him
>start with first episode
>he just sits there with a blank expression
>half way through the episode he asks me to stop
>asks me to leave him alone
>he retreats into his study mumbling something like 'This is what i fought for'.
>haven't heard from him since

what do I do? I didn't mean to upset him. I really don't want to be unfriendly with my gramps in his last years.