forums - sites like http://www.aquaticcommunity.com/aquariumforum/ or www.fishforum.co.za etc
Sections - catagories like "General Chat" or "Cichilids" or "Bettas"
Threads - something like this thing we're in right now ("less is more")
Posts - one person's particular post within a thread, which is within a section, which is hosted on a forum
Make sense? :P
That is the way I see it to, and I think that is what has caused the disagreement, a simple matter of confusion over people calling different parts of the site different names to others.
I don't think there was any offence meant by anybody, just a simple missunderstanding.