The Milwaukee Brewers definitely have some of the classiest fans. One example of this was on August 6th, 2021, when the Brewers were playing the Giants in Milwaukee and Mike Yazstremski make a leaping catch off the wall and scraped his elbow. All the brewers fans were clapping.
The Milwaukee Brewers definitely have good sportsmanship as well. The same game, the Giants won, and after the game, the players on the Brewers hugged all the Giants' players and said "Good game" I don't know if every team does this, bur the Milwaukee Brewers are the first team I saw hug the players after the game and say "Good game"