breastfeeding rant

So me, my SO, our son, my SO's brother and sister in law went to Florida Friday. On the way there we stopped so my son could eat and so we could change his diaper. Note my son is breast fed and formula fed. I wanted to go in to 
nurse my son and my SO made a big deal about it saying that he could just have a bottle and that me breastfeeding him was an inconvenience. I was livid and still am. I have struggle with low supply since he was born and I work really hard to give him as much breast milk as possible and for him to undermine me like that, I just feel so disrespected. Sorry. Can't post this anywhere else so thanks for listening.