I guess this is the main problem of the social dynamics of everyone being MC's harem.
They don't really have incentive to interact with the other member that is not MC.
I guess Hozue kinda got a pass for not talking because she got trauma and all, but the mob girl also doesn't talk to Hozue at all. It feels so much more like friend-stealing rather than circle-expansion, you know?
This is also the case with Izumi and Yuuko at the start, but the main difference is that I believe they get over it after a lot of hanging out together.
Hozue never got the chance for that before lashing out. Though that's also partially her own fault for not reaching out, but still y'know, trauma and all.
Also, the absence of the two lackeys means that this isn't the event that pushed MC to deep end, so I wonder how Hozue even managed to get out of this mess and pushed away MC even harder.