But yeah, having your first sexual experience called "disgusting" would be traumatic. Wonder if interacting with another "disgusting" girl will exacerbate this trauma or help her process it?
I'd say them calling each other "disgusting" and bonding over it is kind of the first step of healing. It very much reminded me of how irl slurs can be reclaimed by the oppressed community. Yes, someone might've gotten called "disgusting" or even "queer", but by accepting that part of yourself and finding fellow hurt souls in similar situations you can build a space in which the thing that's "disgusting" about you is accepted (or even celebrated).
We don't know much about the specifics of Komugi's trauma. Maybe she has a specific fetish which Meguru couldn't accept, maybe it was merely the fact she was a lesbian while Meguru was straight, maybe the sex itself was disgusting for a rather ace Meguru... We also don't know if Ren's trauma is due to any specific experience, or just the feeling that she'd be judged for what she likes.
In any case, we can expect Komugi and Ren to share their troubles and bond over it.