Did this person harass your daughter, peep at her, make crude remarks? More than likely this person used the facilities for which it was intended and left with no trouble caused. Overwhelmingly trans people are the victims of violence not the other way around. This would have been a good teaching opportunity for someone who was so inclined. Where do we draw the line? Do masculine and butch presenting women need to submit to DNA and genital checks to be able to use the bathroom at the same time as your family?