The main advantages of dorms seem to be that kids have some eyes on them, no one has to walk very far to classes (usually), they don't have to worry about meal preparation, sociability is more or less enforced, and being a student is normative. Frankly, those advantages are only advantages for kids who are really pretty immature. Lots of freshmen ARE really pretty immature, of course, but putting them all together in one place is in many ways an accident waiting to happen, and I don't think it does much to reinforce norms of scholarship.
OP is appeasing son in the near term, but is just enabling the perpetuation of his neuroses for the long term
Just a general question. What do people like Tonia39's son do when they get a job and are assigned to sit in a cubicle in an open-floor-plan office, and the co-worker in the adjacent cubicle eats lunch at his desk loudly and the other co-worker across the way talks loudly on the phone and another adjacent co-worker clears his throat frequently?
Do neuroses go away when people force themselves to do things that they find uncomfortable?