I simply pointed something out for seeming rude, I didn't attack or insult. I also thanked them for their feedback, so I'm not sure why you feel the need to say that what I've said wasn't nice, nor that I don't know how to take criticism. I do and I love it 'cause it helps me improve as a writer, hence why I thanked them and did as they suggested.
Nah, it's okay, I wasn't offended. I just don't understand why it needed to be stated. We are all writers, whether we are writing in our native language or not. The level of a writer's grammar or proofreading skills certainly does not depend on what language they speak. After all, some of the most proficient authors in the world have the worst grammar imaginable, and they're first to admit it.