As with most things in life there’s no black/white but rather a continuum. I’ve read several articles on Medium where I simply could not tell what the writer intended because errors of grammar, punctuation, and spelling meant that whatever meaning lay behind was lost to any reader. Clearly this is an example of failure to communicate because the signal-to-noise ratio passed the point of decipherability. Conversely most people can determine what was meant even when the writer doesn’t understand the difference between they’re, their, and there. But as we’re all writing to convey meaning in a world of short attention spans and a belief that “everyone’s efforts are as good as everyone else’s” I’m unclear whether or not such mistakes are actually recognized as such by some writers. If no one points out that “there boat sunked in the ocean and they put on life jacket’s” contains errors, how will the writer learn given that so far at least the remedies you indicate in your article have clearly failed to work? I’m not sure that everyone who takes the time to point out an error is a “grammar Nazi” intent merely on self-gratification; in a way we all have a responsibility for ensuring an adequate signal-to-noise ratio in order that continued communication will be possible. That is, in fact, why the various rules of grammar etc. exist.