Quite simply, because I fucked up.
I know the Bechdel Test, and ISOB fails it. Not even by a little bit. All the way.
This upsets me. And I apologise for it. We forgot. There are no excuses, it was just male blindness.
If you're a guy, and don't understand or see the relevance of any of the above, please take two minutes to read Alison Bechdel's original comic:
Sorry again for the fuck-up.