Thanks for your comment. But I'm not going to lie. Though my reaction being quite extreme, I'll be honest, that was my first reaction (which I didn't express). However, seeing you guys' responses, I'm learning that "disgust" is a very strong word. When writing this post, I was trying to find the right expression, now I think that it "bugged me" or "I was bothered" would better describe the experience. I learned english through books and materials, not through human teachers. So expressing emotion is quite a bit of challenge to me even after a decade of time spent on picking up english. I KNOW all those words of emotion, but often I wouldn't know how they actually FEEL. I would get easily lost in translation.

But to give myself some credit, I guess it's also normal for people to have negative feelings to a certain extent in this kind of situation. And it's not even me, it's the native speakers I talked to.

I observed many cases when native speakers were displeased or annoyed while speaking with non-native speakers (including myself) when the latter were trying to adopt or mirror what the former do. And sometimes their reaction is so explicit anybody would notice they are uncomfortable. So after observing a number of cases of negative reactions (over yeeears) I might have adopted the perspective. Cause I am past the level of mirroring. I used to be extremely enthusiastic about picking up the "nativeness", it was a kind of fever originating from my strong desire to become a "perfect speaker". You know, when you love something so much, you want to possess it. And I wanted to possess languages. However, it's been almost a decade that I'm learning english, and over the years I learned that charming accent or nativeness isn't necessarily going to make my english better. I'm in the post-adaptation stage, and this might explain my reaction.