Which is one thing I like about this board. There isn't a glut of specific conduct rules (that I'm aware of anyway). Rather, posters are trusted with the efficacy of being respectful.
So long as things don't get overtly discourteous or profane, everybody's opinion is welcome. In my opinion, dredging the archives to create "gotcha" moments is in the nebulous gray area of discourtesy. To be fair, PTR's original post falls in the same gray area.
However, the man himself (SDS) has spoken and has no problem with this incidence, so maybe I just have a stick up my arse.