breastfeeding in public

So i’ve chosen to exclusively breastfeed. i had trouble in the beginning because my milk wasn’t coming in but now that it has im only breastfeeding and it feels so amazing to me! today’s my partner’s sister’s birthday and she’s having a dinner at a restaurant. i really wanna go and get out and have my daughter meet her cousins. my partner suggested i pump so we can have bottles ready and we can put some ice packs in our backpack to keep the milk cool. i thought it was a good idea till i remembered there’s no way for us to heat it up. i told him this and he immediately said “its fine we won’t go” and i told him i can just bring our breastfeeding wrap or go to the car and breastfeed when she gets hungry. he says no and that we’re not going anymore. i’ve realized that any time we want to go out to the store he always tells me to pump or to get formula so we can bottle feed her and i don’t have to breastfeed her in public. it makes me upset because it almost feels like he doesn’t want us to go out unless i agree to give her a bottle but i don’t want to if i can just breastfeed. idk what the problem is and i really don’t know how to approach the topic without causing an argument or something. if i’m choosing to breastfeed in the privacy of our car or cover up then it should be fine right? (i have no problem with anyone freeing the nipple and giving their baby food in public it’s natural and shouldn’t offend anyone anyway) am i overthinking it? i’m extremely hormonal right now so i feel like i might be overreacting about every little thing but this is really bugging me.