Seems sus. But honestly its weird what people are about, so I wouldn't really blame you for feeling that way. For example:
"I doubt a label such as 'vitamins for pregnant women' would"
Back when I was an egg (ie: I had no clue I was trans), I remember specifically disliking when my parents got me shampoo with the label "men" on it. I've gone without deodorant because the one I usually got was out of stock and the next closest thing (the only other "vegan" one I knew of) was labeled "men". I've avoided multivitamins marketed for "men". I had no clue why that bothered me... I assumed I was cis-by-default. It still makes no sense why I care about any of that. But I certainly don't doubt there's trans men who care about such labels, even if just a little. Its probably not in the top 100 in the list of priorities, but there's no reason to waste even a sentence defending that kind of wording.
Trans people already deal with enough BS elsewhere. No reason they should tolerate within their own communities. I'm currently banned from such a community I was a regular in and I'll defend them banning me for what they thought I was saying (even though its based on a complete misunderstanding).