system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] Do people have theories about Superman's alien-ness?

In most incarnations of the DC universe, Superman is usually one of the first public alien figures. Most people know that he's from a planet called Krypton, the works.

Does the public or the media have theories or debates about him based on his extraterrestrial origins?

Examples: 

Does he actually have a human appearance, or is it a disguise because his true form would frighten us? Is he even truly a "male" as humans would understand it? Maybe he's actually some sort of jellyfish!

Are his powers natural or the result of advanced technology? 

Is his genial act genuine, or is it an act that covers an alien mindset that humanity can never truly comprehend? Is he protecting people out of the goodness of his heart, or is humanity somehow important for him/his species?

...and so on.

Are discussions like this common? If so, what is the prevailing opinion?
gpt
In the New 52, when the government came looking for the alien who crashlanded in Smallville, Jonathan and Martha pass off a miscarried calf born with two extra legs as the alien. Years later, when Lex Luthor and General Lane are holding Superman captive, Lex shows him the calf and demands to know if that's his true form. Recognizing the calf from his parents' story, Superman just starts laughing at him.