I assume “hmm” as a long think. Or might be a form of hidden hate or sad. I hate to read “hmm” or write it.
I assume a short “ok” is a sulking emotican. Or to show how busy you are. Angry? Might be.
I assume a smile emotican is a pretend or just to show you dont have any word to express. Or you dont care either. Secretive.
I assume a short word which followed by a fullstop is more to a determination, might be a form of angriness or you just like to write in that way. Simple and short.
I assume a non reply email or message is a form of rudeness. But yet you have the right. Simply shows that the subject is ain’t important which deserve an ignorance.
Woman is so master in this kind of things. Haha. Fact.