It's a joke, but it's awfully easy for people to misunderstand. Besides which, would *you* start liking someone's music because one of their fans tried to smother you with a pillow? (much less if they succeeded!)
I'm sorry but just because you know someone that might not like Gaga or her music then that person doesn't deserve to die or anything what's so ever. People are different and we all have different tastes of music. I believe that this picture spreads ignorant hate that is not needed at all. Spread love not kindness.