Why do people feel the need to fat shame and belittle others?

Because of the harassment and bullying, I have severed my relationship with my sister and haven't spoken to her in months. In addition to being narcissistic, my mother is also extremely abusive. My mom pleaded with me to talk to my sister when she came down. Sadly, she was still the same when I got outdoors. She fat shamed me right away, like she always did. She informed me that I should take a stroll around the block, alluding to the recent passing of her best friend's spouse. A devastating heart attack claimed his life while he was on vacation with his wife in Florida. She negatively commented on my hair, as she usually did, saying that if I can't afford a perm, I should go natural. Every hairstyle I had, she told me it was ugly.

Everything that ever came out her mouth to me was very negative. She always fat shamed and bullied me. Whatever helps feed her evil satanic spirit

Why do people feel the need to fat shame and belittle others?
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