My friends mom is rude to me? most of the time?

I used to be at my friends house almost every weekend because she would always invite me over, but I started staying at home each weekend because her mom is mean to me. I know she's joking but like today she says things as if she is serious, for example she said that I couldn't come to a picnic with them (my friend invited me) because apparently I eat too much and then she said with a serious face, look at her look how fat she is? and I just laughed but im a teenage girl and comments like that stick with me. Its just rude because my mom never puts any of my friends in awkward situations like that?
My friends mom is rude to me? most of the time?
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