Heard that too, and joined in. But in my opinion there were also far too many in the crowd who seemed more prepared to groan at a misplaced pass or even boo when we were under pressure than to give encouragement.
This did transmit itself to what is a very young group of players. I didn't see any heads go down, but I did notice one or two starting to 'freeze' - fear of failure taking over from the earlier confidence in their own ability.
Like it or not, this is what negativity does.