How do you deal with a mom who always fat shames you?

I’m actually fit now and I have told her so many times to stop. Even though I’m not fat now, I was a bit chubby when I was younger and still get body dysmorphia. Never expected her to still act this immature as a mother but she thinks it’s hilarious and laughs about it. Honestly it hurts my feelings a lot and I don’t know how to deal with this anymore.
How do you deal with a mom who always fat shames you?
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