That is absolutely untrue of a properly socialized tame bird. However, in my experience raising Irns some babies have a genetic predisposition toward being wild. I have discussed this with other breeders of tame Ringnecks who have had the same experience.
For example my first year breeding ringies I bought out of other nests because I didn't get any fertile eggs. I had 7 babies, two were siblings the rest completely unrelated. They were all very close in age and all raised the same. Two weaned early and "went wild" completely. Absolutely mind boggling to see two babies that you have been feeding by hand turn like that. They were completely unrelated and come from different breeders, both of whom have provided me perfectly fine babies since then.
Some breeders will try to force these babies to "stay tame" and sell them as pets anyway. Here is my advice to you as a breeder:
DO NOT BUY ANY RINGNECK WHO WILL NOT HAPPILY STEP UP FOR YOU WHEN YOU MEET HIM.
Ringnecks are extremely unique and NEARLY impossible to tame if you get a wild one. In my years of working with birds I have tamed many, but never had success with an IRN. I have also only spoken to one person who has successfully "tamed" one, and even those people still cannot physically touch their bird with their hands even to pick her up.
Irns have an extremely bad reaction to emotional neglect as do all parrots and their reaction to being ignored may show up sooner, but one day of a crazy schedule is not going to turn a tame bird wild.
Sent from my iPhone using Tapatalk