Two things to ponder if you dont understand why people might answer “yes.”: Boys pissing in public on trees and in bushes is a normal thing, especially among circles expressing concern about a society that acknowledges trans people exist. Boys using toilets is a plus, at all ages. Second: every Porta potty in existence seems to operate with its gender neutrality without the same kind of panic. If you can square these two notions: Boys using a toilet isn’t odd, strange, or worth a moral panic. You might then see your question isn’t about toilets, and about gendered space and how important it is to have spaces that are exclusive and exclusionary based on something like gender, (or even… other things!)