My mom is very superficial...?

My mother is the worst mother for a girl who is insecure with her appearance.

I can tell that she is extremely prejudiced towards overweight people and gives thin/ pretty people preferential treatment. For ex, my brother. He is younger than me but is extremely skinny and my mom clearly favors him over me and my sister. He is lazy as a vegetable and still gets everything from my parents.

When I happen to gain weight, I can tell my mom often gets angry at me for every small mishap I've committed. And when I get thinner, I can clearly tell she spends more time talking to me and letting me off easy when I'm in trouble.

Do any of you have superficial mothers? How do you deal with that?
My mom is very superficial...?
Post Opinion