Who's an Orphan?

Listen up, numbskull. The joke is that you are being called an orphan. An orphan is a child who does not have parents. So, someone is implying your parents are dead or gone, which is why it's kinda dark but also funny because it's unexpected and probably not true. Plus, you're so dumb you probably don't even know what an orphan is, which makes it even funnier to me, Explain bear.