Puzzles me too so I Google "Ann Coulter" and "holocaust" and get a quarter million hits. In July of 2003 the moon bats were discussing her "next book" going to deny the holocaust happened. They also call her the conservative Maureen Dowd, a transexual, etc. So, yea, she has a right to be mad and combative. See
http://www.reason.com/hitandrun/2003/07/high_noon_for_c.shtml
Will somebody put a picture of Maureen Dowd next to a picture of Ann Coulter? I think Maureen would suffer a bit by comparison. How could those clowns suggest that Ann is a transsexual? NO plastic surgeon is THAT good.
I notice that the critics you link to aren't "liberals" per se but self-proclaimed "libertarians". The Reason writers often complain that the Republican Party needs to go back to being more libertarian. The truth is, the libertarians, especially the Libertarians, need to get their heads out of their asses and become more Republican-- or at least more conservative.
Instead of fighting for the Constitution, smaller government or laws that respect individual intuitive, they've become snarky leftists who prize their libertine social revolution first, and preening as if they're above mere partisan mortals like Ann Coulter (who's done more for shrinking govenment than most of them ever will combined) second. Forget libertarians fixing conservatism. Conservatives need to fix libertarianism.