This - the idea that it's OK to dehumanize people as long as they themselves dehumanize others (by not listening to them?) - also sounds like an excuse that would work for almost any kind of dehumanization.
On the other hand, dehumanizing people because they refuse to follow the rules is also an excuse that would work for almost any kind of dehumanization.
No one said that it's OK to dehumanize people because they refuse to follow the rules.
Yet that's often how the people described as "blankfaces" act.
This is just a rephrasing of "it's not okay to be intolerant to the intolerant"