So frustrated

I am very willing to take advice from other moms as I am a first time mother. Doesn't mean I'll follow it but I have open ears. My boyfriends mom always makes such passive aggressive comments. Or just downright stupid comments. I was with her the other day at a sporting event. My mother was also there. He hadn't eaten in 4 hours and I like to keep him on a schedule as far as eating goes so that it doesn't interfere with our routine at night. He usually gets fussy around the same times each day because he's hungry. My boyfriends mom was holding him and my mom made a comment about him not having eaten in 4 hours. My boyfriends mom has the audacity to say she thinks we overfeed him. Followed by a comment saying "he can probably just have a bottle of water" UM WHAT? He's 4 months today. I'm already very controlling about who takes care of my son and he's only ever been under my parents care when we're not there. Now I literally don't trust her at all. Thinking about it actually angers me and I just need to vent haha