I've been seeing this girl for a couple of months now and it's become pretty clear she's not a great texter.  As in, a lot of her texting feels robotic; less like a conversation between two friends (or in this case, a couple) and more like a conversation between business partners who organize meetings from time to time.  As a whole it's pretty annoying, but by far the worst part is when she texts me "K".  For example, I might text her that I'm on my way to pick her up for a date or whatever, and she'll respond "K".

Somehow she's apparently missed the memo that sending "K" is kind of a passive aggressive way of saying "I really don't give a shit about whatever it was you just said."  I know she doesn't mean it that way at all, and she's not cold in our face-to-face interactions, but it *is* kind of annoying, especially combined with her poor texting habits in general.

I want to bring it up with her, but on the other hand I'm worried that I'm just being petty.  After all, it's just a text message and it's certainly not meant in a rude way.  Should I just sweep this under the rug?