Yeah, I can absolutely see how helping someone improve their skills at a language can be seen as rude.
For the non-arrogant people though, I think it would be beneficial to have a grammar corrections comment section. So maybe there could be an option for the author of the post to enable or disable such a section in their post just like YouTube gives one the option to disable comments.
That's exactly what I was thinking about.
If you see this site as a community, we should help each other in these kind of things.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.