It’s the day after the events in This Rebellious Nature and Spock is suffering the consequences of his impulsive actions.*
Sarek takes a teenaged Spock with him on an Ambassadorial trip to Earth. This does not work out the way a father might hope.*
At the end of the movie, they certainly seemed to hop right into moving on and seemed to completely forget that most of the cadets in the Academy had been killed at Vulcan. So…yeah. I couldn’t just let that go and somehow, I doubt that Jim Kirk would, either.*