My breastmilk making him a broken hearted baby!?? are you serious right now Mother in law😐

my mother in law is VERY OLD SCHOOL and goes by Myths,okay yes my husband and I have been fighting and screaming lately I'm not proud of it and his been upsetting me and we talking about divorce and in the process or through out the day when my baby wakes,I breastfeed him in the other room because I'm his food supply I have to give him my breast milk, so my mother in law says his upset THROUGH my breast milk because if I'm upset his upset,really!??? Iv heard diet affects breast milk,not emotion's!..most ridiculous thing Iv ever heard in my life!!