Your mom is just like Rapunzel, but instead of letting down her hair, she lets everyone down! OHHHHH!
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Explanation
Explain Bear
Listen up, Bruh. You're so dense, light bends around you. The joke is a play on words. Rapunzel lets down her hair, but "your mom" lets people down, implying she disappoints them. It's an insult disguised as a fairytale reference. Get it now, or do I need to draw you a diagram?