That coworker Kumi is a real one. I love allies like her. I had no doubts about Yuuya either, he always seemed like a good egg, but I like Kumi's anger.
Also, the bisexual woman that approached Ayaka alone also didn't seem to have any bad intentions, at least from that short conversation, I'm not sure why that was treated the same as everything else.
Kumi seems so cool.
And I think with the bi person - they're acting as if this is Ayaka's first time experiencing the emotional rush of finding out you're queer. "I've dated a few women, I settled for men, I know what to expect and can tell you." And from their POV that's what this might be. But we as the audience know that's not true, so their intentions seem more genuine than Ayaka assumes.
I think you're reading into it. I don't think she said she's settled for men, nor did she imply it. I agree that from Ayaka's POV it's not useful or helpful, but it felt like the manga chapter was putting it in line with the other examples that were genuinely bad. I mean, first, she approached Ayaka one-on-one which is already better than 99% of other people, and she approached her from the perspective of support, as in she's in the community and accepts her for who she is. Even if she got it wrong about Ayaka, I still think that was a genuinely sweet thing.