Nah, it is just a way for people to make themselves feel superior. It happens a lot here in America too. I think my english is fine, but say one word just a tiny bit off and some of them will make a "what?" with a face of pure confusion as if you were speaking in a completely foreign language.

My main language is Spanish and when I speak with people practicing their Spanish I can usually understand them no matter their accent or how bad their pronunciation is. It has to be really bad for me not to understand them. The context of the conversation helps a lot too. But here in America say a word a bit off and people make a big deal out of it. C'est la vie.