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This isn’t about being nicer, per se, but also about why we mimic. It also mentions that if you’re able to carry a tune, you might be more likely to subconsciously mimic an accent. You might also be more empathetic. https://spinalresearch.com.au/5133-2/
I always find myself "mimicking" the cadence and rhythm and oftentimes a slight accent and I'm super nice! People who piss me off though get the full royal pip pip hey ho 
Haha, that’s right, don’t let them get away with it!
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