Actually Shannon/Dr. Will used Hurley's toothbrush to clean the toilet, FYI.And although I think it inappropriate to pour a drink over someones head, I don't think of it as a 'violent' act. After all, they had a food fight in the backyard, and BB themselves poured butter/grease over them all in the food comps, etc.
I would rather have tea on my head than butter/grease any day. But then again, he should apologize for doing it, but if you think BB is going to chuck out one of the only interesting people in the house over a glass of tea, then your crazy. The Jen/Kail/D.i.c.k fights are pretty much the only thing going on in the house. Unless you count Amber crying for days on end and Kail/Jamika reading the bible. FUN and EXCITING!
It is astonishing how foolish humans can be in groups, especially when they follow their leaders without question - States: The Bene Gesserit View. All States Are an Abstraction.