Clark, we're fictional here. No matter what their suspicions are when it comes down to it they're not going to truly believe you could be Superman. You're too mythological for them to think you could be real. Even if many of them probably wish you were they can't accept the possibility that you exist. Just like the damn attacks that happened not all that long ago will probably be considered the work of gang members and people on drugs.
Oh I know you do. Why do you think I delight in doing it so much?
It's more comfortable than that couch you seem to think I'd be sleeping on if you suddenly grew a beard and I had to deal with a scratchy face rubbing up against me when I'm trying to get comfortable while sleeping.