Anecdotally I have seen the same. It's easy for a native speaker to be offended when corrected because it's their first (and often only) language... they should

Anecdotally I have seen the same. It's easy for a native speaker to be offended when corrected because it's their first (and often only) language... they should be good at it. Language-learners tend to be quite open to correction in any language.