Words can always be misunderstood if the writer's assumptions about the audience are wrong enough. You don't have to look further than @fatbob's comments about "quite" and "interesting" above. Cultural and educational factors come into play. Yadda, yadda.Proper grammar is really just style and it don't matter a bit so long as the words cannot be misunderstood.
Meaning comes not only from words, but from the construction of sentences and paragraphs. "Eats, shoots, and leaves," etc. So I disagree that grammar is "just" style. I'm perfectly prepared to stand up and say that certain sentences have bad grammar because I believe strongly in the value of a common framework for prose communication. Not sure I'd say the same for style.
Annnnnnnd, style carries meaning too.
in short, it's complicated, and wishful reductionism doesn't change that.