Ah the beautiful game! Don't you just love moments like that! Every player runs into them, of course. You continually meet the fan who knows best - what jockeys call the rider in the stands. Their opinionated commetnts ought to be water off a duck's back. But the game's not that kind. However misinformed or based on ignorance it may be, what is said still touches a raw nerve in virtually every player. And never improves his game. Think about that next time you feel like slagging off somebody having a 'mare of a game. Put it this way: do you really think he doesn't know already?
If it's like that playing in front of a large crowd, just think how much worse it must be out our level where individual comments can be heard much more easily.