Earlier quoted context omitted.
Do you fear Jung's ideas? If they are incoherent garbage with no merit, shouldn't they just collapse under their own weight?
History doesn't support this. Bad ideas can be remarkably persistent. Yes I fear Jung's ideas if they give rise to beliefs that are harmful to me, or to society. An example would be biased stereotypes surrounding the introvert / extravert dichotomy. Disclosure: I'd probably test as an extravert, but would advise against identifying as an introvert in a business setting due to the bias against introverts.
I don't think any undue stereotypes around the introversion / extraversion dimension come from Jung, but have simply been attached to the concept by ill-informed society. It's hard to fault Jung for this. Introversion / Extraversion is also part of the Big 5 and has more substantial scientific backing than the foundations laid by Jung.