Facepalm

1. "Man" in certain contexts is shorthand for "Human" or "Humankind". Imagine how tedious it would be to write a sentence where everytime you wanted to use this shorthand, you'd instead "Men, Women and Children".
2. OP even said "Men, women and children died because of who they were", so your point of "referring to the dead collectively as men" makes no sense.
3. 99.9% of people reading OP's comment wouldn't have even begun thinking about this.

Overall, I think it's more insensitive to read a comment like OP's, and instead of taking the right point home and moving along, you decide to nitpick in an attempt at some sort of "Gotcha", which couldn't have been done more wrongly and with such confidence (or arrogance?)