My husband is a talker. I'm a transcriptionist so I have on a headset and I'm transcribing. He will try to talk to me while I'm working; headset on and all. I don't think he's even aware of it. If I'm reading, he's talking. As I am typing this right now he is talking about Chipotle's and how he can go for a burrito. I do get snappy when there's a lot going on in the background. Why? Because I am concentrating, and I am very focused in what I'm doing. It takes a lot of mental energy for me to get to that level of concentration. So when I have to have pull myself out of my concentration I do get snappy.
For me it has little to do with my childhood but more to do with the dislike of being disturbed when I focused.