the norms have to be applied generally.
I just can't see how this would work, nor how you'd go about doing this.
In many cases you may not know if someone's performing a fetish. However in this instance, the man literally wrote a book saying he does.
Actually, it's interesting - the advance of promoting transgenderism as anodyne, non-sexual and completely acceptable has probably spoiled the fun for some fetishists, compelling them to act more outrageously to achieve 'transgression'.
Grayson Perry talked about how he no longer gets 'a stiffie' from dressing up as a young girl, because it's now so accepted - even expected, in his case.
So for someone looking to transgress, they have to push the boundaries further. They may do this by, say, publishing a whole book on how they are getting off. And then going ahead and parading their fetish in public.
It's caught the public in a bit of a bind - acceptance of him in his outfit gives the 'dupers delight' supply of having fooled everyone, whereas outrage/anger/disgust gives the thrill of humiliation/attention, etc.
Not easy to try and apply boundaries, rules, or standards when somebody's whole intent is to subvert, transgress, or undermine them.