TERF's don't really like the FtMs either. They either consider them gender traitors or victims of grooming (the latter is right on the money, especially if you consider social contagion grooming). But you're correct that they don't have anywhere near the burning hatred for FtMs as they do for MtFs. With the latter it's mainly outrage that they've found a cheat code to escape the lowest rung in caste system feminists have worked so hard to relegate men to.