This outlook is alien to me. I'm quite the opposite; I'm happy reading and judging anonymous comments purely on the strength of the argument being made there and then (although I don't ignore the background and history of a commenter when that is available to me).
Not attacking your point of view; just very interesting to see an approach described so different to mine.
I only look through the post history of someone if I feel they have a particularly interesting outlook, or if they're batshit crazy and I'm a bit bored.