Your initial premise is wrong. People who go to football matches make no pretence about being as talented as they people they are watching, yet they, as paying customers, can decry what they see and criticise the talent on display. It's exactly the same with music fans. 99.9% of them couldn't dream of playing like the musicians they enjoy, and yet they can still distinguish between artistically good and bad - in their book. I do think there's a difference in those who are paid to critique art - as Brendan Behan said: "Critics are like eunuchs in a harem; they know how it's done, they've seen it done every day, but they're unable to do it themselves.". But it's poor reasoning to ask someone to come up with something simply because they criticise it. I could ask you which music you don't enjoy, then ask you to come up with a tune and play it as well as those you don't enjoy.
P.