linguistics
https://xkcd.com/2390/
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I find people who actually study language are more tolerant toward different pronunciations and informal speech and colloquialisms and less likely to be grammar nazis.
Probably because they understand that all language is made up and they all change constantly. There’s no hard and fast rules.
Language science/grammar/etc are all just observations of a natural phenomena, they are not laws to dictate.
See description vs prescription for anyone interested