> You can look at how regional UK dialects affect employability and education outcomes.
If you apply for a job in China and you only speak broken Chinese, resembling a pidgin language, it’s not “discrimination” if you are not hired. Similarly, if you apply to a position where you are expected to speak standard English and you only speak a lesser known dialect, that is not discrimination either. It’s not meeting job requirements. Yes it’s unfortunate that those who don’t have the skill of speaking standard English cannot obtain those jobs, just as it’s unfortunate non-Chinese speakers cannot obtain jobs in Chinese-speaking areas. The good news is that we have brains that are capable of learning new skills.
> My claim was that prescriptive approaches to language facilitate and magnify discrimination and have historically frequently been used to justify and enforce discrimination.
This is just false. Discrimination is a social phenomenon that itself is causal to your so-called prescriptive approach to language, not the other way around. In other words, the pre-existing discriminatory attitude causes the exclusionary behavior in language not vice versa. It’s silly to blame racism/classism on the promotion of correct English. Especially when the existence of a standard for correct English makes it clear and unambiguous for new people entering the English-speaking world how they can most effectively communicate with existing English speakers.