why's his family judging me ??

Okay so I'm naturally small, my mom is small. And I've been trying to come to terms with it but it seems like everytime my boyfriend has his family over his mom likes to make these comments about my weight. She'll just say things like "have you ate we don't need you losing any weight now" And then my bfs auntie points at his 4 year old cousin dipping Cheetos into pudding and says well Madison eats chicken nuggets ... you should eat those cause Madison looks like she weighs more than you. like wtf do i even say to shit like that I'm 18 years old getting compared to a 4 year old, I'm not even that small. shit hurts my feelings