Personality tests are generally correct and effective when used properly.
Last Friday night I attended a dinner held subsequent to a regional bioethics conference. I sat next to the doctor who organized the conference, and those at our table discussed personality tests.
His hospital team was experiencing significant communication problems until they employed personality tests. From the knowledge gleaned, he was able to make slight changes in job duties, and each person was able to use the information when deciding how to approach another teammate. He said things are much, much better now.
I am an INTJ, in a female body no less. This means that some types are going to love me, and some will hate me, but rarely will someone have neutral feelings towards me.
Surgeons usually love me, but social workers…not so much. ; )
If I care about the person or the relationship (work/friends), and they are the type who normally conflict with INTJs, I use the Meyers Briggs information to adjust my approach. If I don’t care about them, I do nothing to adjust my approach and do not care if they are offended. …can’t please everybody.