What point is that?
No I have not missed the point. Have you ever had a stainless steel sink? They never look clean except when you have just polished it with stainless steel cleaner. The OP did not give the DM age in the first post, nor any other details about the DM at that time. The responses were conjecture.
It is not unlike a similar situation where you drive a car out of the car wash and a bird poops over it. Would that make you cross, or would you think it a sign of good luck?
The DM polished the stainless steel sink until it gleamed. Men polish cars in the same way, and get angry, especially if someone sees it polished and don't care.
The OP comes into the kitchen and uses the sink. The DM gets angry and throws something at the OP which causes injury. How long between those actions? Was the DM already in the kitchen and saw the OP spoil the gleam or did she just walk in, or walk in later and the OP had left it dirty?
We don't know: after all, who would admit that?
All it needed was an apology and a promise to clean the sink again. Something happened in between to cause the item to be thrown and the wound to appear. Was the DM in the kitchen with her, that she should immediately explode? It could be that the OP had used the sink and left it dirty.
The violence was wrong, but so was the OP in undoing the DM's work and not apologising. (for example, school cleaners: are they justified in getting cross each evening when they see the state of the washroom handbasins? Children can be taught to use their paper towel to clean off the tide mark)
THE POINT I was attempting to make, and I am sorry if I didn't hit the spot, is that it is better to get rid of whatever is the catalyst and replace it with a sink more easily cleaned.
The thing is to redeem something good out of a bad situation.