I don't think it's gone sour at all, nothing wrong with somebody correcting someone else with more accurate information. If your knowledge of old bugs is not up to scratch, then don't write your post as though you're stating a fact - make it a question. If you take exception to being corrected then make sure your right.
As a general forum rule, I don't like peoples opinions stated as facts. They're facts if they can be backed up with compelling evidence.
Happiness is a stock VW