why is my mom and sister so mean and negative towards me?

I called my mom today and was telling her about how my sister is so rude towards me always judging me for what I eat, calls me fat in rude comments by telling me she’s a s & m and that xxl or xl could probably fit me.

Just says rude shit like that so I told my mom and she did nothing but agree w my sister and just be rude to me.

I’m so tired of their negativity.... my mom was rude on the phone (today) and I already know why she was late on her registration and forgot to change her address but doesn’t wanna use hers to pay because she has to do a smog test and all that and doesn’t wanna pay for it and asked to use mine and I told her I don’t mind but I don’t think it’s a good idea to do that and lie & she freaked out on me for it so of course she’ll be negative towards me and put me down because I didn’t help her with something that I personally don’t wanna get in trouble with.