I watched this game - Hawaii had several kids (Valdes, Bobbitt, Nevels, and Webster-Chan) who constantly chirped, and did the in-your-face scream or a dance after every made basket as if they were beating Kentucky. That got the crowd into the game. I didn't see any of the UCD kids act that way, and it didn't seem to be necessary because Hawaii was winning big the entire 2nd half- they were up by as many as 26 points with 8 minutes left.
Then the people in the crowd started screaming at the UCD players, and throwing objects on the floor, many of them appeared to be thrown at the UCD players, especially as the UCD reserves started cutting into the Hawaii lead. The officials waited a bit too long to try to stop that behavior, and finally called a technical foul on the home team in the last minute or so, then another technical on Valdes for his jawing. That just got the students more riled up and they threw even more stuff.
Jim Les actually tried to defuse the situation by pulling his starters out of the game early, but Hawaii left their starters in to run up the score and to do more of their trash talking. After the game, Jim lead his players off the court quickly, and it was to get them out of the situation, not because he didn't want them to shake hands.