I’m sure that most people think that their own style of posting is reasonable, so suggesting that we should play nicely is rather patronising and assumes that you know better than the rest of us, Sarahmob.
What do you hope to achieve by this thread? People worrying that they may have said something ‘catty’, or others digging up threads where someone has disagreed with them as an example of ‘impolite’ posting?
This is a moderated site, and anything the moderators miss can be challenged by posters if they feel that lines have been crossed, as can you if there are particular comments that have upset you. Far better to do that than make vague insinuations, I think.