No negative comments or jokes until 72 hours after the funeral. Hate their politics / art / theology / shows all you like but remember they leave family and friends behind, often a spouse and children. Let them have time and space to grieve for a bit, no matter how egregious their statements may be during such a time.
Folks, lets be better than they are, okay?
If your comment or joke isn't as fresh and as pertinent 72 hours after they're buried, it was never fresh or pertinent to begin with.
A year from now you won't be able to remember their name.
Let them depart in peace.