“they do not, honestly believe that anyone else can legitimately disagree with them.”
I don’t think that’s the core of the problem.
I do not honestly believe that anyone else can legitimately disagree with Hayek or von Mises.
The problem is that they are evil.
All leftist thought, from the limousine liberalism of a George Clooney to the murderous horrors of Mao, Stalin, and Pol Pot, is of and from Satan. Leftism is a contaminant in the human cognosphere, not a natural component of it.
It is not a legitimate position that a rational man of good will can espouse. It does not deserve a hearing. It should not be tolerated.
Nothing in there that I can find to disagree with you on.