Much human written communication is more clear if the spelling, grammar and punctuation are good.
Having said that, I will be embarrassed if you find a typo or other mistake in this post. If you do, feel free to mock me. I write and edit for a living, after all, so you should expect a certain level of quality in this space.
However, please think before you belittle anyone else over such details.
Sometimes spelling and grammar are simply not important.
Twitter users like to pick on poor spellers. Those pickers annoy me to no end, regardless of the pickee*. Their reactions to a Trump tweet a few weeks ago were typical.
Here’s one example.
Brian Klaas is a journalist, by the way. You can find my response here if you’re interested, but here’s a summary:
I don’t care that Trump can’t spell or punch letters on his phone without making a mistake. Millions of people are poor spellers. It doesn’t matter. The message matters.
Mocking a person over spelling in social media marks you as a snob.
For another example of what matters, take a look at Inmate Blogger, which I came across just the other day. Read a few of the posts by incarcerated men and women.
Some are polished and punctuated to near perfection.
Some are profoundly eloquent in their rawness.
* pickee: One who is picked upon. If it is not in your dictionary, it should be.
The Smith Compound 
Public ridicule is different from supportive, private feedback. When a social media platform has the necessary tools (direct reply to only the original author), it can be a help to gently correct such things as misused words. That said, it is probably better to have an established link with the author. Negative comments from a stranger have less chance of being taken well, I think.
Publicly calling out the original author (Mr. Trump) was probably the point in the case you cited. Some social media platforms seem to, at least partially, exist for political ridicule.
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