Not only is she petty, but she's factually wrong. Somewhere in this rant she made a made the remark "Sure are a lot of blacksmiths in my mentions today", and actual blacksmiths and martial artist practitioners pointed out, that while women can and have worn men's armor/sparring protection for some time, having space for boobs makes it for more comfortable for extended use and gives the wearer more flexibility (since their breasts aren't pressed into their pecs).

Literally just go online and search "women's sparring chest protection". This is modern day armor. It was designed with comfort and practicality in mind. Most women in martial arts choose it over men's chest protection because of this, or at least wear a protective bra under it.

As someone who dislikes boob-plate armor, I feel like she is reaching here. the female armor looks mostly the same as male one.