Everybody around here used to speak with a nasal accent, but that's changing now, people who live in the city are slowly becoming less nasal. There are various explanations for it. Some say the nasal accent was really just a way of talking that kept the flies out of the mouth and now that we are mainly urbanites there's no longer need for that. if you look at the third and fourth generation farmers, you'll notice the nasal accent also corresponds to the complete lack of lip movement, so I think there's likely a relationship.
At any rate I'm not sure why
Gulliver thought that the Mac would appear to country folk more, as most of the Mac stores seems to be in bigger cities or whether he was just a snob trying to make fun of rural people (We Amigans are by definition elitists), but the comment really made no sense.
I have friends who run a farm to the west of Dubbo, hot dry country bordering on the outback. It's hard, backbreaking work, if Gulliver spent a few days working with them maybe he's be less disdaining of people who live in rural areas. My guess is he wouldn't last half a day trying to keep up with these "nasal speakers" he thinks are funny.

What exactly is a "nasal accent"? Nasality is a feature of resonance, not pronunciation.
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moto