I was watching comedy series, Man Seeking Woman.
A group of people was discussing what to text a girl. I mean, they were discussing how to make good texts for the girl.
Josh: Tell you what. I'm gonna start it off. "Hey, it's Josh."
General: See? Already, you've failed. You've got a comma after your "hey" and a period after "Josh." What's next, semicolons and footnotes?
Josh: Okay, fine, no... No punctuation.
Here is a video clip for the scene at 1:00.
I don't understand why General said you've failed. What's the point? I cannot find either gag point and grammar point.