I quite honestly find it a bit of a stretch for us to expect other people's posts here on SI to evoke all kinds of emotions in our WS's.
Men are hardwired differently than women, and while a post may have affected you, I wouldn't expect it to have the same affect on most men.
However, your husband SHOULD be affected by the pain he's caused you directly with his own actions. The fact that he seems completely detached and completely unaffected by what he did is really your bigger issue here, not his lack of reaction to a stranger's post here on SI.
He just seems completely unremorseful and it's almost like he's agitated that you 'caught' him and he's now got to pay the price for his behavior. But I don't get the impression that he actually sees the wrong that he did.