It's the content that matters and it's not the business of other folk to be criticising people for how they write. Or anything else for that matter in my opinion.
If someone posts and asks for advice or opinions on something that's fair enough, though even then it should be kind. But unless they do, who is anyone to set themselves up as judge?
Good job Robert's not easily offended! If this was my ex having these sort of criticisms about his writing (he is badly dyslexic and can't spell or punctuate), despite his bull and bluster, he would have been deeply hurt.