Well, some women themselves have an issue with the rent-a-womb business line and it isn't necessarily a matter of hatred that moves them. They find it a bit undignified for a woman to act as a mere object, crossed out of that child's existence from birth. Child will always wonder about his biological mother, probably. It isn't necessarily a matter of hatred to talk about it, perhaps there is more of it from those who don't want it talked about.