Fans booing when the opposition has the ball

[JackSomething]

The West Stand all got up and applauded Ryan Giggs as he got subbed, he didn't play for us.. it's got to be the weirdest one of the lot

I can promise you at least two people in the West Stand didn't get up and applaud Giggs during any of our PL games against Man United. I don't remember everyone around me standing up and clapping him, but my memory is shit, so I'll take your word for it.