Turns out, we aren't just being hyper-sensitive when we get a text with a period and get all bent about it. Researchers now confirms that sending a text with a period does, in fact, make you seem pissed off.
American University, we only use sentence-final punctuation 39 percent of the time in texts and 45 percent of the time in online chats, leaving the recipient to wonder why you put that period at the end of this particular text and not the others.
"In the world of texting and IMing ... the default is to end just by stopping, with no punctuation mark at all," Mark Liberman, a professor of linguistics at the University of Pennsylvania told the New Republic in an email. "In that situation, choosing to add a period also adds meaning because the reader(s) need to figure out why you did it. And what they infer, plausibly enough, is something like 'This is final, this is the end of the discussion or at least the end of what I have to contribute to it.'"
Imagine yourself getting these two texts:
"That's fine" : All right, cool, you're cool with it, I'm cool with it, everything is chill.
...as opposed to this...
"That's fine." : Um, clearly you are NOT fine with that and I'd much rather you just say so instead of being so weird and cryptic about it.
The lesson: Use the period wisely because that one little tiny dot sends a very strong message!