Before we can see something it must be understood. It must be perceived as true before it can be seen as false. When another person speaks we must understand what they have said in the way they meant it before we can run it through our thinking processes and find where it is in conflict with our own understandings. An idea must be understood as true before it can be understood as false.
Or … if someone speaks something which might be true when analyzed carefully, but it is too complex in the moment for the hearer to understand, then a break in understanding occurs and further statements don’t build on the speaker’s argument and don’t make sense and therefore become erroneous. At that point no matter what the speaker says to clarify his statements they are perceived as wrong because they don’t make sense.
Therefore, a speaker must always speak in a way that can be understood by all of the audience or he will soon lose their attention and he will be interrupted.