So, you're asking about exercising one's personal right not to associate with a person of type X in a… public school? When we engage in activities in a public place, we have to come to grips with the fact that those same public places may be occupied by people doing things with which we disagree: driving AMC Gremlins, wearing white after Labor Day, voting Leftist, etc. You must tolerate it, or, when you discover it happening in your vicinity, leave said vicinity. If you find yourself being hounded out of public places by people of type X forcing you to leave their vicinity (due to you exercising your own right of association by using their own right of association), then I believe I have already mentioned adopting a hermitic lifestyle as a legitimate solution. Even for a student at a public school, this is possible. It's called home schooling. When one chooses to attend a public school or whatever description, it is expected that one gives up a measure of that right of association, whether in terms of associating with the same campus, associating with the same classrooms, or associating with the same gender-segregated facilities.
Even if one's daughter is in a private school where people of type X are allowed around her, you have the option of removing her from said vicinity. With a private school, however, at least the mere threat of such removal may lead to some action on your behalf which you find agreeable. A public school is beholden under law to respect the rights of people of type X as well, and so such threats to exercise your rights of association are unlikely to move them. I support everyone's right to home school their children, bar none.
Just as there are legal balancing acts which take place between the rights of one person and the rights of another, there are balancing acts which play out within a single individual on a daily basis. You have the right not to associate with a person of type X, but you want to, are deeply desirous of, relieving one's full bowel and bladder in a convenient public restroom, which may also be occupied at the moment by a person of type X. Hmmm, decisions, decisions. You, and you alone, will have to make that decision as to which of those needs you will give priority, keeping in mind that applying fist to face or boot to ass, as I mentioned above, is an option that equates to you committing the crime of battery under Indiana law. Choose wisely.
Keep also in mind that the vast majority of people in bathrooms are there for the exact same reasons you are. But then, perhaps that is the very reason you are so trepidatious about them being there with your wife and/or daughter.
So, you're saying your daughter is the type of person who would take the fist to face and boot to ass tack on a person of type X entering a public restroom to utilize the facilities in the manner for which they were designed and installed? That's the type of daughter you raised?
The rights of the minority supersede those of the majority. Got it.