Lately I've been kicked from chat twice for idling. The first time I was told it was a joke kick. The 2nd time I was told it was a new rule, and of course it's not on the rule page at the time of writing (revision at time of writing).
I was then chatting with Sky Monster about it after I came back and asked him about it, to which he told me that it was a new rule. To which I then asked him why it wasn't on the rules page, to which he said he hadn't added it yet. I then asked him why he didn't add it, and to which he said this will only go in circles.
The chat when I got kicked.
This shows that it was done for pleasure, and the rule excuse was simply a cover. I believe that this is ridiculous.
UPDATE: Talked with some others. Disabling comments