I admit being guilty of this, but this bears repeating as superheroes can and do exist outside of comics (something like El Chapulin Colorado and Sky High being born on television with no connection to comics whatsoever) just as comics can live without superheroes (actually that’s true for Archie, Peanuts, Calvin and Hobbes, Garfield and Doonesbury). It only seems that way if it weren’t for the promotion of superheroes, not that I have anything against them.
But rather the odd fact that most people don’t read superhero comics, let alone on a daily basis should indicate that superheroes can and do exist outside of comics and comics can live without them. For some reason, comic book movies almost always refers to those featuring superheroes even though things like Ghost World and American Splendor are also based off of comic books (just not of the cape variety). Actually if we stretch the definition to encompass comic strips, then the likes of Peanuts and Garfield should also be included.
Superheroes can exist outside of comics and comics can live without them, but the tendency to equate the two with each other can be detrimental to those who do comics without superheroes and why it can be misleading to call a superhero show a comic book show when Archie and Garfield also qualify.