There's a saying that goes "people in glass houses shouldn't throw stones".
Ok, how about, nobody should throw stones?
My policy is "no stone throwing regardless of housing situation."
Don't do it.
There is one exception though - if you're trapped in a glass house, and you have a stone, throw it. What are you? An idiot?
So, really, it's only people in glass houses that should throw stones. (provided they are trapped in a house with a stone). It's a little longer, but you know....