Y'all arguing this are falling for the alt-right's trap. It is so completely insubstantial to be arguing about Chelsea Clinton, one way or another.
Like of this response were about, say, Engel's response to Omar, you *might* have something, but Clinton's response was fine, but a white supremacist just massacred 49 people and we have folks getting banned over a mildly-controversial thing someone said to someone else who had no involvement in any of that.
The right wing wins because we keep tearing each other down and hot damn are some of the premises for those arguments taking place flimsy.