If you were required to compete with people of a gender you do not identify with, even when event organisers recognise you as more fitting among the other group, that's a ban. There are trans masc people. Requiring them to compete with women is unfair and disrespectful. Requiring trans fem people to do so is the same. The rules around gender identification in regulated sports require proof of medical treatment yada yada to accept that people are 'trans enough', which is itself discriminatory. Trans people are a lot less distinct and separate from everyone else than you'd be led to think.