Echo, I wasn't enormously disgusted by Phillip's behaviour, either. Weren't they drinking alcohol at that meal? I just assumed he was a bit tiddly and wasn't thinking quite clearly and jumped into the pool. Also, it looked like there was a hot tub or something, separate from the pool - so those that were offended by Phillip's mess could go into the other pool.
I will admit that I was taken aback by the overhead view of Phillip's "dirt cloud", but everyone seemed to be giving him quite a wide berth (I think I would have, also).
I guess I'm saying that it was a thoughtless thing for him to do, but I'm not about to lambast him over it.