[gojomo]

A presenter could do that, but the greater specificity – "my girlfriend" – makes for a stronger, more relatable, and mostly self-deprecating joke. After all, he's not saying Maven is "like" his specific, real girlfriend, or girlfriends in general. He's saying Maven "is" his problematic girlfriend.

That makes it an embarrassing confession, about a universally-understandable human situation – having some frustrations with a romantic partner. But he's in a grating relationship with a software tool! The joke's on him!

There's no necessary implication all girlfriends/partners, or all women, fit that model – just that it's a recognizable pattern. Anyone who's ever seen a sitcom, family-comedy-movie, adult-comedy-movie, or stand-up-comic will be familiar with the fact that some SOs/hookups/spouses can sometimes annoy, in the manner of the bullet points.