"She won't breastfeed"

I don't know if it's me being pregnant and I'm just very irritable so small things can upset me. I know it's difficult but I've been set on breast feeding for awhile now and my father in law tells my husband that "I won't breast feed." Like... WHAT. How can you tell me what I will and won't do with my baby, when I just want the best for them. (I'm not trying to shame anyone who formula feeds btw) Would you be kind of upset too?