The question was "can you find me some reputable cryptographers that support your position?" which is just ad hominem and should be ignored as such, except it does indicate that the person asking it doesn't have any better argument than ad hominem.

If you think tptacek has no better arguments then you're sorely mistaken.

And implying that someone is unqualified is not in fact ad hominem. The desire to interview a disagreeing expert doesn't look fake either.