Hizmom...if you're referring to the post I think you are, it was directed at an MtF whose mother wants her to hide the breasts that HRT is causing her to develop, not an FtM. Your son might end up with some tissue damage from binding, but as long as he binds safely (i.e. Follows the rule "if it starts to hurt, stop or find a new method"), you shouldn't have to worry. The admonition to not bind was, in this case, given to someone who intends to keep her breasts, and therefore would want to keep them in good shape.