My boyfriends grandma is a bully

I love my boyfriend's family but his grandma had a mind of her own. On several occasions she has pointed out the fact that I'm a bigger girl. Just today she called me a pig because of my weight. She's also told my boyfriend that he shouldn't have kids with me because I'll give my kids diabetes. These aren't the only ways she chooses to bully me. I need advice on how to handle the situation without being disrespectful.

Your boyfriend should be handling this I’ll say this don’t associate with her until she can respect you but I wouldn’t go as far as disrespecting her but I wouldn’t tolerate what she’s doing either because once you disrespect her then it’ll be a lifelong battle just disengage with her don’t speak with her don’t go around her and let her know you’re not gonna tolerate her disrespect