Well actually, I thought it was rude for a number of reasons. A) The assumption that one didn't look at any other page on the thread. B) The assumption that any person, especially new persons, may have known that the originator of the subject had long left the building. C) The assumption that when a thread goes to be 50 million comments that one ought to be crassly told to go through potentially all of them to find a single hyperlink. That last one is what made it "Prickable" in my book...
...lastly, the offending poster, knew he was being a prick and said so. purposely being a prick gives other people the right to call you one too.