I can understand why that might be an instant and 'obvious' reaction - but I would question it - there is already a men's category and a women's category in most sports (some even have an open category) - everyone is born either a man or a woman, so everyone already has a category. For those running sport, adding an additional category carries an overhead in admin / logistics / timings / staffing / etc. I have been a tennis referee for a number of years, and it is already complicated enough managing ages where it splits into boys and girls, without having to offer an additional category...
I think that in sport we have to start by saying:
- we have male / female categories - does this disadvantage anyone - the answer is no...
then we ask what is the impact if we did look to meet these demands:
- if men compete in women's events then that disadvantages the women - so should obviously not be allowed
- if a third category is required, then that disadvantages those who run events (often volunteers)
- if we leave it as now we disadvantage no-one...
the conclusion is I think pretty obvious...
the only challenge that exists (and which is not being fully addressed) is transmen who take hormones which could arguably give them an advantage over other women in the women's categories... but arguably they should be managed as you would any competitor who takes drug which may enhance their performance....
there is no automatic entitlement to do as one wishes - so it is important to stick to a structured, common-sense approach, and for those who want to cause issues, they should simply be told no!