I don't ever say anything, but I admit that I ignore the people asking questions that have been asked 100 times. This is really the only thing I've ever seen people on this forum be blunt about. I hope this isn't what is being referred to here though, because that's not a "linux forum" phenomenon. Doing a quick search before asking a question is just the proper thing to do on any support forum. Windows forums aren't any more accepting of such things...nor car forums, nor guitar forums, etc.

Interestingly, I think I've actually seen more posts on here referring to "linux snobs" and such than I have anything derogatory towards windows users. It seems like some people come in expecting everybody to be rude...and a few seem to be looking for anything that will confirm that expectation.