A bit off topic, but I simply thing this is the commenter trying to be grammatically correct without using "him" as is standard in English. I've noticed quite a few writers lately (especially in tech) doing this more often. I seemed to remember RMS doing this in a recent post of his, using feminine pronouns as the generic singular 3rd person.
Interesting point. I'm not sure I agree with the connotation of sexism that it promotes. I would feel a gender neutral pronoun such as they/them/their would be more appropriate, regardless of grammatical correctness.
Grammatical correctness is a fluid thing. "they/them/their" used singularily is one of those things that is on the edge of being accepted. Thing is, schools are slow to react and will keep saying it's wrong using a rigid form of thinking about grammatical correctness.
It may or may not have been in customary informal usage for that long [citation needed], but it is still considered incorrect in strict, rigorous, formal usage. (Yes, this is on the cusp of changing, but for now, it's still true.) In formal usage, pronouns agree in gender and in number with their antecedents.
You can easily find citations in http://en.wikipedia.org/wiki/Singular_they from Chaucer, Shakespeare, Jane Austen, George Bernard Shaw, and so on. It's not "customary informal usage", it's just a regular, ordinary feature of the English language.
In the absence of a third person, singular pronoun of ambiguous gender in English, I prefer to use "her" as it makes a nice change from the standard use of the masculine pronoun that is all too common.
Read into that what you will, but perhaps you're just trying too hard to take offence.
