It is because wrong is the opposite of right, as in the only way to be and once upon a time, the acceptable way to be. Anyone who didn't conform were shut away in institutions, denied a life.
People who were wrong, or did wrong, deserved to be taken out of society.
"Which phrase did you suggest to them?"
I would say "do they have a condition, diagnosed or suspected?"
"Wrong" suggests that "bad, incorrect etc", as in wrong doing. It is linked to "Value", in Ethics, Law and Philosophy.
There is no need to use that word when describing medical etc conditions.
It is easy to use language more effectively and with more thought.
I can walk round identifying lots of "wrong" in people, my DD's SN, or anyone's else's SN wouldn't be on that list and suggests that they are not "right" because they do not follow the majority.