Socionics causes people to infringe upon each other's boundaries by inappropriately discussing the qualities of the other person (inappropriately from the perspective of normal etiquette). Once this behavior has begun, it permanently affects a relationship. It may never be the same as when there was a "safe" distance between the people.
If two people become close friends or lovers, this behavior is appropriate and generally does not get in the way.
However, if either person does not accept the self-typing of the other, then conflict ensues regardless of the "actual" types of the two people (if there even is such a thing as an "actual" type).