I would agree. Howard, and the reaction to him, by Gard is all related to what goes on in the games. So far, Gard and Turgeon have had the nerve/audacity to actually call Howard out on his nonsense coaching of the opponent's team during games. In 2021, the Iowa bench nearly got into it with Michigan's bench during a timeout in the game at Ann Arbor. If you watch games, Howard is talking to the other team just about the entire game. And coaches don't like the other team's coach trying to coach their own players. It spilled out last year in the Maryland-Michigan game when Turgeon had enough of Howard yelling stuff at the Maryland team during a timeout. Right before Turgeon and Howard get into it, you can see Turgeon gesture toward the ref who is standing right there, as if to say "are you hearing this?" The ref did nothing, so Turgeon tells Howard to shut up and Howard responds with he's going to kill Turgeon. Very mature stuff.
So the end of the Wisconsin-Michigan game is all an extension of this. Wisconsin gets under every team's skin with how they play to begin with, between Davison and his nut-punching and to their general attitude that they invented basketball. Howard is just terrible to go against due to how he acts in games. End of game, Wisconsin up 15 under a minute left. Gard puts in the scrubs. Howard leaves a couple starters in and presses. Wisconsin has trouble getting it up the court, ball knocked out of bounds. Gard calls TO to reset the 10 second clock. Both coaches are letting their inner asshole show through. But fine, if both guys want to coach to the end of the game, so be it. The issue comes when they can't just let it go and move on. Howard feels the needs to tell Gard he won't forget it, and Gard feels the need to say something in return.
I equate it to what happened at the end of the Iowa-Minnesota football game in 2020. Iowa beating Gophers handily, KF puts in the 2nd and 3rd teamers. Fleck leaves starters in, is calling timeouts to try and get a TD on the board. So KF burns all his TO's as the Gophers get down near the goal line. Neither coach likes the other, both are being a bit petty at the end of a game that is no longer in doubt. Difference is they don't act like third-graders at the end of the game, they do the blow-by handshake and move on. Amazing that two football coaches show way more emotional maturity than the head coaches for Wisconsin and Michigan.
Where does this go from here? No idea. I doubt Howard changes a great deal. He had a long NBA career and got to be a head coach at Michigan being this way. If he just concentrates on coaching his team, probably will suit him well in the long run.