I think it is a cultural difference.

I'm French. When I mispronounce something people will correct me. That's how we learn and it is expected.

Now when I voicechat with American people and say something they don't understand I just get some "polite" silence.

So I think it is a case of people taking offense because of a culture difference. "They're white, using the same characters as us so they're the same", nope.