How do I get my mom to stop treating me like a child?

So I’m 21 years old and whenever my mom or I watch a movie like tonight and there’s a woman in lingerie or a bikini she always turns at me and says “you didn’t close your eyes or nothing?” But when I was younger she always put her hands over my eyes when a woman appeared in a bikini or clothing of sort. It’s really annoying she’s treating like this at my age. How do I get her to stop?
How do I get my mom to stop treating me like a child?
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