[AnimalMuppet]

> In general people use "him" as a replacement for "him/her".

That's one of the ways people use "him". Other times, they use "him" to mean that the individual in question is male.

These days, "her" to combat the implicit assumption that people must be male is common enough, it's almost safer to assume that "him" means someone who is specifically male.

[JupiterMoon]

> These days, "her" to combat the implicit assumption that people must be male is common enough, it's almost safer to assume that "him" means someone who is specifically male.

I think this is not true yet. Anecdotally I personally only noticed this first a few months ago and no one I've discussed it with in real life has yet known what I'm talking about.