[SomeStupidPoint]

It makes the title less useful to focus on the gendered, social relationship than who the girlfriend was as a student. In the case of my friends, "girlfriend" could mean anything from "basically math illiterate" to "has a PhD in a technical field that isn't ML and doublechecks my proofs cause she's smarter than me".

The author decided not to tell us anything about who he taught -- where on that range she fell -- just what her social role was... His.

That's what people are objecting to: in an article about teaching your gf something, why not make it about who she is as a student and what she learned instead of her social status as your mate?

It's that fundamental phrasing and framing of her, as it being more important to know her social status than anything about her academics, that people object to.

(All that aside, this is a silly thing to complain about. But it isn't nothing.)