"What does "I somehow misconstrued" mean?"

In this context it means, pretty clearly, I believe I was quite right in recognising the passage in question as am unprovoked personal attack on Shimrod, for which an apology would be in order. (My post of 01 Aug 08 - 12:05 PM might be helpful.)

I have never heard such self-pitying drivel in my entire life, I would rather hope somebody shot me before I came out with such crap.

I think that even Teribus might see that as a personal attack if it has been directed at himself.