One cannot teach spiritual truth (which determines reality and one's perception of reality) to others. One can only confirm what the other has already learned for themselves.
The higher truths sound like nonsense to those who have not learned them.

We are all on different levels of awareness and functionality.
It is essential that we all are on different levels as we advance through our interactions and conflicts with each other.

It is common that some people will remain at or close to the same level their entire Earthly lifespan.
They will become angry and indignant when exposed to things that they do not believe.
They think and act according to their nature and understanding as we all do.