I understand the point about context, but is still unfair to use a word like “failure” in this situation. Yes, maybe the OP son did not end up where they wanted or where he could have been admitted, had he dotted all the i’s and all the stars aligned.
So “disappointed” perhaps. But the word failure has objective meanings to it. It is extremely irritating to read it in this instance when there are so many other parents dealing with much, much worse situations.