Birthmom's are not Bm's or poop or shit or whatever else bodily fuction thing you can come up with

Why do adoptive parents insist on using the term "bm" for birthmother? Do they not know that bm means poop, shit, crap, dump or whatever else people tend to use for when they go number two? I know that the majority don't use this term but some do. It shows so little disrespect for the person who chose you to be a parent for their child. I know birthmother, birthmom, first mom or natural mom or what ever other word could be used to describe a woman who chose to bring a child into the world and break her own heart to give that child to people who would become Mom and Dad. So, quit being lazy or ignorant and take another few seconds to spell out the word better.