Really now? Maybe 50 posts like that (if that). That would be 1%. I figure if even 40% of my posts are worth something I have thousands of quality posts.
90% of the time I say that I usually also give an answer or link to one. It's only the really clueless people who get the rant and that's it.
There is no need to answer such kind of stupid comments. You are all the time helpful for all of us, and if some sensitive guy got once insulted from such a post. nobody has a problem with that except for that person himself.
I think that such comments are needy to keep the forums useful and helpful.