My mum called me fatty and it's hurting me a lot?

I am overweight and I know that. I am happy with myself but I want to lose some weight. And I've been doing exercises past three months which made me lose some inches. I had been very happy with the progress but today my mum called me fatty. I mean I know I'm fat, that's why I am trying to lose weight, so why this fat shaming?
Now she says that sometimes to piss me off but what hurt me most was the remark she made to my younger brother "fatty ate a lot today." This made me feel the worst!

Please, I request you not to say anything to my mum. I know she loves me a lot and this fat shaming runs in the family so I don't really blame her but man, it really hurt me today.
My mum called me fatty and it's hurting me a lot?
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