Combine the patriarchal commodification of women and children together with the mindset of toxic masculinity that treats the death of a man cynically as both a removal of competition, and as a failure on their part to survive, and you get a subconscious mindset that anyone else will only care about deaths if they were women’s or children’s.
Also, more specific to this conflict, Israel is actively framing any adult male (and many male minors) as being a potential combatant, and using that to dismiss their deaths as not bad. Pointing out that they are killing so many women and children (not just minors, but children) is also being done to make it harder for them to claim that their attacks are all or even mostly killing combatants.