Generally in Japan, being outed as a gay person is seen in a bad light and childish. This on top of the "old people", that probably are more conservative on their views, being paranoid feels like a normal response to what happened.
Cut her some slack, her coworker just shunned her the night before.
Let her grief, for gay people confessing to someone straight takes a lot of effort, even if it probably wont work.
Honestly sounds like an overgeneralized swipe at the Japanese people. Look genius, this is a work of fiction. This could easily take the route of an older co-worker sympathizing with a broken heart and them becoming friends.
The thing is you don't know. I don't know.
I want to see this play out, but we can't. I'm stuck with the one chapter with her wallowing in self pity and her worrying about something even she doesn't know how it will play out. It could be good, it could be bad. Coin toss, I don't know.
I personally want to see this story play out and see how she will pull herself out of her self pity party and make herself happy in the long run. And all I see in the comments is "JAPAN IS BAD BECAUSE THEY DON'T LIKE GAY". Okay, LOL, run with that.