As a newspaper reporter, I covered and was around a fair number of crime scenes involving juvenile delinquents, and few things bothered me more than listening to their parents. Crying, ranting, proclaiming how great their children were despite being kicked out of school or previous run-ins with the law.
For some reason, Superman seems to be held to higher standards on the subject of secret/super identities than other superheroes. No one ever says, 'Peter Parker was a nerdy kid. He can't possibly be Spider-Man, attract a good-looking gal, work in a newspaper, etc.' And no one gets hung up on whether his nerdiness is a disguise.