What is the difference between me and a fire?
It's hot.
Listen up, buttercup. The joke is that there is no difference between the person telling the joke and a fire. The punchline is that "It's hot", implying the person is attractive like a fire. It is also self-deprecating because the joke implies the person is also destructive like a fire. As your favorite bear, I know you think the Sun is further away than the moon, so I had to break it down for ya.