If that's the case then, why do we celebrate breast feeding? Surely it's just 'meeting a basic human need' as you put it??
Because in some communities, there is a lot of stigma around breastfeeding and who 'should' be doing it. You may have seen it pushed or seen people congratulated, but that is far from universal.
I spent my entire first pregnancy being told I probably couldn't breastfeed and how awful it is, I had relatives make spectacles of looking away when I fed my child to try to shame me, I had family and random people in the street tell me how gross breastfeeding is. I've had people infer and outright say I was getting sexual gratification from feeding my child and that having a picture taken while breastfeeding proved I liked being watched in a sexual way...
When I was in hospital with my first, the midwife made my baby go through multiple heel pricks to check his blood sugar before we could leave because I was breastfeeding. I was made to feel like him crying, even during a nappy change, meant I was starving him and that as a teen mum, I obviously had no clue, and had lies made up about my body to 'prove' I shouldn't be breastfeeding - my small chest and 'deep milk ducts' (I still don't know what that means) meant I was killing my child by breastfeeding. I was even lied to about social services wanting to talk to me (and they were told I wanted to talk to them) in part because of the midwife's concern, thankfully they helped get this midwife to back off.
Formula feeding isn't unique in having some people act like it's horrible. Feeding isn't unique in this. I've had people shout at me in the streets for using mobility devices and for using baby carriers. I've been told my child has a speech disability because I have a foreign accent and that my other child has an autoimmune disorder because I don't bathe her enough. I've been told people like me shouldn't have kids since before I had them.
People will have their biases and talk shite over anything we do as parents and for some of us, even being parents. It can be downright nasty, it hurts, but as adults, we need to be emotionally robust enough or have tools to handle weak slogans and population level initiatives for improvements even when we can't be part of it. I can't meet my local communities annual summer campaign around walking, I know the many health benefits and my limitations & increased risks make me sad at times, but that's for me to handle, not to try to prevent my community doing any health initiatives that I can't do.