teacher's pronunciation?

Thesedays many midleschool or highschool students think their English teacher's pronunciation should be perfect and even judge their language ability just by their accent.
When it comes to my position, I am also trying to have "native-like" accent as far as I can.
But here's the thing. As English become more internationalized, we should accept the variety of it.
English is no longer English-speaking countries' own.
There are thousand of millions of people who use English as many purpose as their numbers.
Austrailian English is English. Singaporean English is also Englsih and so forth...
Can you just devaluate the quality of English teacher who has Korean accent?
Never do such a ridiculous misjudgement!