What can you say to a statement like that? The best way to take care of this kind of question is to carefully explain what the differences are between a planet and star.
I told the young man that a star has to make it's own light. It's like a big nuclear reactor. "Do you think we could live on a nuclear reactor?" I said, hoping that he would understand that life is not possible to survive on a star. Remember, any pictures of the Earth you've seen from space that are nice and bright is just sunlight reflecting off of it. If you put a flashlight's light beam against a dark room's wall, does it mean that the wall is making it's own light? Of course not.
Do we go around the sun or does the sun go around us? He knew the answer to this question, which helped, because I explained that planets orbit the sun, not the other way around.
Of course, there are many more ways you can show that Earth is a planet and not a star, but these two examples were good enough to show that Earth is planet and nothing more.
For more info on the sun and Earth relationship, check out http://www.youtube.com/watch?v=FjCKwkJfg6Y
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