I would like baseball to have the same amount of celebrating as the NBA. Homers = dunks. The beauty of baseball is you have little pauses in play where what you do has no effect on the game. One of the most intense games I've seen in many years was the Puerto Rico vs Netherlands World Baseball Classic game, in which damn near every single hit and out prompted a major celebration and the fans were feeding on all of it.
I don't find the "it's April"/"it's early in the game" stuff very compelling. We'd be furious if a player came out after the game and said not to get on them about their bad game or out or whatever because it's early and the games don't matter much. Most people go to one game a year, if that. Everything that happens in that game is super important to them. Players owe it to the fans to be all the way in the game and if that means the emotions come pouring out in some harmless way, great.
As for this specific situation, there are a few things that really piss me off:
Tim Anderson was thrown out of the game despite the fact it was clear he was just trying to go to 1B. Both the first "fight" and the second flare-up with Ricky happened because the Royals bench and coaching staff taking the field.
If the MLB is in Tim's corner and wants to make him the poster child of the "Let the Kids Play" stuff, they need to punish Keller more than having him ejected late in his start. You need to regulate the celebrations, the retaliation, or both. MLB has made clear they're not going to regulate the celebrations.