Feeding and formula - feeling judged

Wife wanted to breastfeed but it really didn't work out for her. We switched to formula and some people have been weirdly judgmental about it. Like our pediatrician said the baby is healthy and growing perfect but my mom keeps mentioning breast is best. Kid is 4 months old, eating great, happy baby. Why do people make you feel bad about this stuff? Just wanted to vent. Formula is fine and anyone judging other dads about feeding choices can back off.