[quote=evershadow]
There's different ways of doing it. One common way is for player A to use generic ways of phrasing so that he/she can ask/say multiple questions/things in the one post which better simulates conversation avoiding one-liners.
[/quote]

I believe EverShadow put it well. 

You can use a single post to address multiple conversations at once. 

An example: 

A: Pointing at player B "That's what I said idiot!". Player A turns to look at player C "Oh really? I thought I was the best". 

I feel like this would be a good way to maintain multiple conversations and have a more natural flow.