Wait, wait, I've got it...

First, read this if you haven't already.  (Oh, who am I kidding.  It's Larry Correia doing what he does even better than writing kick-ass novels.  Of course you've read it.)

Here's the tiny bit at the end I'm going to address just for shits & giggles:

Nothing shows you mean serious business like closing a political argument by talking about your opponent’s dick. Quick question though, all of those hundreds of female students that I certified to carry concealed weapons, where they compensating for their tiny vaginas?

These people deal with obvious sex characteristics, and vaginas are kinda hidden.  And a small one is considered desirable anyway, so it wouldn't make much of an insult.

No, I think it's something a little more obvious than that female gun owners are compensating for: small boobs.

I mean, see how much my gun obviously dwarfs mine?

Oh, wait...

That's right...

Dammit.   Next theory.

Penis envy, anyone? Yeah, yeah, psychoanalysis has been debunked for decades now, and that was actually one of the first aspects to fall, but still.  Anti-gunners aren't exactly known for their sound science, are they?