People can just not engage in conversations they don’t like. This forum has a branching structure, it is easy to hide a topic that you don’t like.

If someone was to be really odious and hateful, the presence of that sort of thing could be harmful, but this seems like a polite correction of a common problem. And it is an international forum, there are plenty of people who might get something from language-chat.

I pointed it out because when I lived in France, I personally appreciated people pointing out grammatical mistakes I made in French. If the OP doesn’t care about sounding more like a native English speaker, that’s perfectly fine and he can just ignore my comment.

As someone learning a language that's not my native one, people who correct my Chinese kindly are the absolute gold standard. People who correct it rudely are rare but still more helpful than people who say nothing and just move on. This is very common in language learning communities. My default assumption is that other people who are learning a language that I know natively probably feel similar, and would appreciate kind, contextual corrections. I am happy to adjust if someone lets me know they don't want that or if it's against the rules of a specific forum.