This is not uncommon when an applicant is so focused on one reach college and reiterates why it is so important to have a number of reach, match, and safety schools that the applicant likes, that appear affordable and that he/she would be happy to attend.
That said, after a couple of days of sulking I’d encourage your S to re-examine the other options available and not to jeopardize his college future by falling off the rails in terms of grades this semester. There are so many colleges where he can have a great 4 year experience and get where he wants to go in life and he will have to embrace a school that has accepted him.