Call them tampons and sanitary towels and don't bother to say which of the umpty-zillion gender-identities they are for, and the problem goes away. Nobody who doesn't need them is going to buy them except for someone who needs them, in any case.
Or not more than once. It's money wasted if you have no use for them.
Boots seem to have managed this with their non-sex-labelled tampons, and so have Tampax though the latter are on dodgy ground with their claim "Tampax Compak tampons have been gynaecologically tested" it is probably triggering in some way or other for someone somewhere.