I think the hilarity is because it's the same point, put across repeatedly on several threads, nag. I get the feeling (could be wrong, natch, but I will no doubt be corrected if I am) that gn is not going to stop putting forward her interesting and robust, but not rude or offensive, posts, and that alison is not going to stop complaining about their rudeness (arrogance, bullying, etc). It is quite amusing in a sighing and shaking the head gently kind of way.
People, and GNHQ, have suggested that anything which is felt to be a personal attack, or which is felt to be bullying, should be reported to them. They DO delete anything that contravenes forum rules. Seems fair to me.
I don't think robustness of view, or even apparent arrogance in a post, is usually regarded as contravening said rules, however unpalatable some people may find such things. That's just life.