I mean you do have a point.
I guess I would rather explain myself because I feel like that's the integrity move. I'm going to tell you why I left. You were late. You didn't give me a heads-up. I think that's disrespectful. It doesn't take a lot to send a quick text message, voice message, make a 10 second phone call.
If I just leave quietly, I don't open the door for the woman to try to justify her tardiness. That's true. You are right.
But in both circumstances, she's still going to make me look like the jerk no matter what. And if I'm going to be the jerk, you're at least going to know why. I'm not going to leave it up in the air. It's going to be clear.