Yeah but if the goal of the room is to foment hatred and target harassment at an individual who isn't in the room, that's still abuse.
Clubhouse is not just private phone calls. It's a social network.
Two people chatting fits this criteria. You can have a private chat on Clubhouse between two people.
Yes, you can have a private chat on Clubhouse. You can also have a private chat on Facebook or Twitter. They are all social networks.
I don't think trying to find edge cases for what constitutes a social network is helpful to this conversation.