@Florent
this is the "what turns me on threat" not opposite
I can understand you Florent, but there is something to say to you complaint.
First:
If you are in the middle of an really hot or interessting chat it is of course simple courtesy to tell a partner that you got in invitation you want to accept or you are going to invite somebody yourself. This is especially true if the one going to the room has started the chat.
I know this Problem myself.
But:
You have to make differences. If fe you started the chat and you did not more than a few exchanges of messages with your partner just doing some intro i think it is not nexessary to tell everybody that you are going to the room. This would be a lot of work and i for myself would rather stop to say hello to everybody who starts a chat with me that to feel the obligation to tell everybody what i am going to do. A chat some other started is in m opinion free of obligations as long as there is no real hot or interessting discussion.
And:
The time factor is important. In some cases it is nearly impossible to remember who started talking to you and what the chat window is too small und if you get messages from different partners very fast it is even difficult to scroll back as with every new message it scroll to the end of the messages again. So if its some time ago since the last message I think there too is no obligation to say bye, as this takes a lot of time and you often even dont know if the partner is still there.
And2:
There is the Problem of too much guys and too few (hetero or really bi) girls. I think many girls know this: You log in and quite a lot of men start chatting to you. I understand this and i always try to answer at least a "i am busy sorry" message but sometimes it is too much. You cant even read the messages properly not to speak of answering them. In this cases i too sometimes just escape to the room with robot or log out.
LOL In generel you are right Florent, it is a turn off when you chat and the partner just leaves. I just wanted to explain to you that it is sometimes not that easy to be courteous enough. I hope i didnt make you angry.

And maybe the partner didnt realize she was rude. So why dont send her a message and explain it in a nice and friendly way?
Good luck in the future.