I feel compelled to confront a lesbian mother about her daughter's sexual education.
Is there a reason why you want to confront the mother?
She has lied to me about how her daughter was taught what she learns in her sex ed.
You must feel strongly about the sexual education classes, but you shouldn't get involved with how she wants to raise her child. Keep you feelings to yourself.
Fine, I'll tell her that gay is a choice.
I get that you feel strongly about this, but you need to focus on that it's the parents decision to let her daughter go through this. I would recommend focusing your mind elsewhere and worrying about problems in your own life. I don't mean that harshly I just think it would help you.