When they can disagree with your decision to bottle-feed on many fronts and you "explain" or defend your decision, you have given them another opportunity to change your mind.
Many parents expressed anger at the permission form they must sign to bottle-feed, with some saying they felt like it was admitting they were a bad parent.
While some breastfeeding advocates undoubtedly put too much pressure on women to breastfeed, similarly there is a certain segment of women who try to push women to bottle-feed.