It's about culture – and looking down on someone just because they talk different is ignorant.
It's a shame, but linguistic discrimination is super common, and there doesn't seem to be much of a trend to change that. Likely because of education forcing the idea there's "One True English" (TM) and that if you didn't learn it you're dumb...Despite the fact nobody learns it natively, and you have to actually learn it, not acquire like your native dialect...So it all comes down to proper education, and did you learn when to use it, etc. Linguistic register is a nice term for everyone to Google.
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It's a shame, but linguistic discrimination is super common, and there doesn't seem to be much of a trend to change that. Likely because of education forcing the idea there's "One True English" (TM) and that if you didn't learn it you're dumb...Despite the fact nobody learns it natively, and you have to actually learn it, not acquire like your native dialect...So it all comes down to proper education, and did you learn when to use it, etc. Linguistic register is a nice term for everyone to Google.