As a woman, my first reaction to something being named "PMS", I'd book it in the "insensitive" category. I know lots of other women will too. We've heard a few too many PMS remarks from men to not have a reaction.
It's not just insensitive if it's insensitive to you.
But at the same time, giving the author a heads-up that they might inadvertently sort themselves in that group is, I think, a kindness.