That is the challenge of a writer, to rightly convey nuance. With all that in mind you won’t type the way you speak.
A sentence is indeed a statement. But what you put in there, by careful choice, can make a big difference.
The next issue is that not everyone knows how to decipher plain English. So you might have to revert to smileys for a joke, winks for a wise-crack, capital for a complaint, and bold for attacks.