Family wanting me to give baby formula and breastfeeding in public

So yesterday I was talking to my grandma, whom I love but she can get in my nerves really easy cause she’s a know it all. Well, we were talking about what I wanted for the baby and that her and my aunt were gonna get me gift cards for formula and other stuff and that I needed to stock pile formula. My grandma never breastfed and she’s basing her information on my aunt who gave birth 10 years ago and couldn’t breastfeed her second child. Meanwhile my mom breastfed 2/3 kids and has more knowledge about it. She also stated that women who “whip out their titty, so everyone can see them while they feed their child are disgusting” it just really irritates me. Like I wanna whip my titty out of spite when my daughter is born.