I suppose the simple answer to this is misconceptions, bias and stereotypes.
Of course there may be some truth in there as well. Jung essentially points out that the extroverted thinking type creates formula's, or systems, based in the truths of objective reality, if someone goes against this formula
The thing is that Te users are all about fairness, they subordinate others as they subordinate themselves, if they are less than perfect then this is a fault within them and not with the formula.
This is actually what a great deal of modern societal systems are based on, the formulations of Te. Especially those that govern law, because the law must apply to all in the same way or else be rendered mute. In other words no one can be above the law or else the law falls apart and so too must society. There are subjectivities here which might make such a statement appear to be wrong, but Jung explains it as being objective evaluations of subjective situations.
Where this becomes a problem is if an unhealthy Te user supresses their feeling too much and it comes out in an unconscious manner. If this happens then we end up with an individual who no longer separates him or herself from the formula, instead he/she becomes the formula, 'my word is law because I say so'.
As Jung writes:
Interestingly many of the traits people often attribute to dominant Fe users who are unhealthy, Jung actually attributes to unhealthy Te users.
Also from the same section:
and
I actually find it fascinating just how different his descriptions of the functional types are from some of the accepted stereotypes on boards like these.