How many transmen is menstruation an issue for? If their gender dysphoria is so bad that female bodily functions are upsetting then surely they'd use any of the options available which halt menstruation? And, if they are on T then their periods will stop because they are effectively menopausal and we don't really know what will happen but presumably their risk of heart disease, osteoporosis and dementia will increase as per any female who loses oestrogen
What is the issue? Trans men don't need to bleed.
Is the problem actually that trans women WON'T have periods and anyone talking about biological functions which are unattainable if you are male is a bit upsetting for them?