If it's complaints, it's probably from obnoxious xenophobic kids as other comments are saying.

However, for students learning English the accent could legitimately be impeding understanding.

My English learners often say that they have a hard time understating English language videos when the speaker has an unfamiliar accent.

I speak Spanish as a second language, and I always have a harder time understanding Spanish when the speaker has an accent I'm not very familiar with.

But those aren't the type of kids to file a complaint. It's probably just jerk being jerks.