Part of what you're saying does make some sense, because it is true that guitarplayers are very critisizing about other guitarplayers, but the fact remains, that the people on stage shouldn't screw up a lot, they're on that stage to make music and entertain, not just stand there and try to play on of their songs and screw it up, when you go and see a band, you don't just go there to see the band, but to see them play the songs that you like.

Guitarplayers only critisize other guitarplayers, because that is what people do, just like football players get critisized by people who have no idea what they're talking about, if you play the guitar, you're a musician. If you're a musician you will get critisized by other musicians. It's the way things work an you can't stop it, nor should you, otherwise new musicians wouldn't get inspired when seeing their favorite band play.