Here's my thought process upon reading this. (Initially, I assumed “git 'er done” meant something like ‘women are unimportant except as sex objects, and I misread “unwilling” as “willing”.)

• ‘How comes that guy, who when talking about sex on his blog gets mind-killed to the point of forgetting how to do high-school maths, makes so much sense everywhere else? Maybe he was saner when younger, then got worse with age, or something.’ I follow the link, expecting it to go to somewhere other than Armed and Dangerous, e.g. somewhere on catb.org.
• I notice the link does go to his blog, and to a recent post at that. ‘So he is still capable of talking sense about such topics after all?’ I notice I am confused.
• I realize he said “unwilling” not “willing”. ‘Er... Nope. He's crazy as usual.’
• Appalled at the idea that anyone, even ESR, would say anything like that in public with an almost straight face, I decide to look “git 'er done” up. ‘Oh, that makes perfect sense, and I agree with him. But that's not about sex (except insofar as the cut-through-the-bullshit communication style is less rare among men than among women), so that doesn't actually show he's not mind-killed beyond all repair.’

(Anyway, if an adult woman complains because you called her a girl, the course of action that leaves you the most time to get stuff done is apologizing, not doing that again, and getting back to work, not endlessly whining about how ridiculous the PC crowd are.)