Comments about milk quality

My mom babysat for me and saw the milk i pumped in the fridge and was concerned about it because the fat solidifies on top of it. She said there must be something wrong with it and that my diet must be to blame (ah yes, that yogurt cup i managed to eat today is definitely to blame...). She insists her milk never had fat like that. Im so tired of comments from people who literally had children decades ago who somehow think they actually remember what it was like when they barely remember what they had for dinner yesterday.