We still had to (have to) be on guard all the time. Every new care situation (camp, sports, babysitter, friends' parents) had to get a briefing. We had to check every room for jerks. Because being misgendered, or forced to explain yourself is traumatic for a young kid.
Not specifically about this child; I want to make a more general observation based on how I see that statement.
So a child that might have been uncomfortable with people commenting on her/his unusual choice of clothes is now in the even more difficult situation of being uncomfortable when anyone finds out her/his sex. All they’ve done is to replace one uncomfortable situation with another.
My personal opinion is that a child would have had a better learning experience if she/he had parents who fully supported her/him in their clothing and activity choices and intervened strongly on behalf of their child whenever anyone interfered or bullied them.