Why don't moobs cause back pain like boobs?

Why is it ”moobs”, male breast, do not cause back pain? One of the reasons that women say they have for wearing bras is that they say their breast would cause them back pain if not supported, which makes me wonder of those women small enough not to have any hand but still wear them. Going off that logic there are many, many men who should be wearing a ”brobra” or something for support because they have moobs way larger than many women’s boobs; which should create pain in the back. Either men are not complaining about the aching back their mobs are giving them or men have superior back muscles or core over women that allows them not to need support?