Having lived most of my life in India, noise has never been an issue for me, even while doing tasks that require intense concentration. It's like the brain implements a band pass filter for most ambient noise, you never notice it. I have also noticed that the more I concentrate on a task at hand, the less I notice anything else around me.
On the other hand, I have been living outside India for the past few years and I notice noise a lot more.
Make what you want of this but it has lead me to believe that our perception of noise is a function of our state of mind, the ambient noise level and our conditioning/habituation. The takeaway being that it is possible to learn to ignore noise, since in most situations one may not be able to control the source of the noise.