There are poorly understood neurological disorders that can cause hypersensitivity to sound, which can present as being easily distracted by sound. See misophon

There are poorly understood neurological disorders that can cause hypersensitivity to sound, which can present as being easily distracted by sound. See misophonia as an example (http://en.wikipedia.org/wiki/Misophonia http://en.wikipedia.org/wiki/Misophonia). I'm not saying everyone who yells at you for being loud suffers from this condition, but when you say, "Stop blaming externalities for your inability to concentrate," it smacks of telling the clinically depressed to just think happy thoughts and cheer the fuck up.