But I cannot process, and sometimes not focus on multiple people talking, even when they're not talking through one another. I can tell you a lot generally about their speech, just not what it says. Where they're standing, tone of voice, are they moving, what their intentions are. But if there are 2 conversations in earshot of me I cannot tell you what anybody is saying even if they're shouting to me. If 3 people are standing around and talking I can only participate if I totally ignore one of them and just blindly shut them out, whatever they're saying. Sometimes it gets worse and even with little disturbance I just cannot tell anymore what people are saying to me.
People don't understand. In a 1:1 conversation I'm warm, open, attentive and so on. In a 3 way or more conversation, I'm cold, absent, distracted, annoying (because: very bored) ... Worse, often suddenly, from their perspective, I no longer understand them. I've learned to just hide this, and guess, and find some other excuse to turn the conversation back into a 1:1 conversation.