[afterburner]

You can have as low a bar for "genuine friend" as you like, and I don't think the final evidence (one step text dismissal) can clear it.

That said the author maybe does see the fakeness ("They want it to feel like a friendship" ie. not be an actual friendship, just something like that feels like it, fine line I know but it's desired performance vs actual emotion). However she still thinks they "owe" her something.

But English lessons in Japan must be like... I dunno, grocery shopping to us. I'm guessing tutoring is more common in Japan than in North America. When you decide never to go to a particular grocery store, you don't give long heartfelt goodbyes. You just stop going.