It’s fine to vent. Please understand that your child didn’t get NO acceptances because fate was against him. There is/are a reason/reasons. Being cryptic helps no one because without context, the post simply sounds like a rant and not helpful advice. I do hope he gets at least one acceptance.
@thumper has linked a classic thread. Here is another: Asian rejected from everywhere POSTMORTEM
I do believe this student was very hard on himself, and I really wish he would have come back to update, but he never did.