Always been an element of our support, who love having digs at flair players - I believe in my dad's day, it was the likes of Alan Suddick and Jinky Smith who used to get pelters. In the last couple of decades, we've seen the likes of Ginola, Robert and now ASM targeted when they hit poor form.
Whilst Ginola/Robert delivered, they were part of good sides - but still got grief about not tracking back/being lazy. ASM is a flair player and frustrating, but he's also playing in a very limited side whilst going through a patch of dodgy form. In a better side with better player around him, he will become a better player. Keep the faith.
It's also worth remembering that I'm old enough for to remember Gazza and Beardsley getting the bird, during the mid-late 80's. For some folk, there is no pleasing!