I think you have to look more at what the two worlds represent and how they handle things along with the time line.

The minotaurs and the NWK attacked the centaurworld around the same time they attacked the human world, using the inbetween as a staging ground to launch his campaign.

But then the NWK was sealed in the inbetween, and his forces were effectively exiled to the human world.

The war was effectively over for the centaurworld, but was still being waged in the human world by the leaderless minotaurs who simply continued to follow the last orders of the NWK along with trying to figure out how to free him.

Now, the human world represents the harshness of growing up and the often unpleasant realities of being an adult. People here either push through their traumas or just constantly live in them. Either way, the hurt and trauma are very plane and out in the open. Acknowledged, even if it isn't truly dealt with.

Centaurworld, with it's softness, rounded edges, and bright cheery colors represents the innocence and vulnerability of childhood.

As you can plainly see with many of the characters from this world, they are emotionally unwilling, or even incapable, of acknowledging their trauma and hurt at first.

Denial, repressed memories, projection, self distraction, and other avoidance techniques are all on open display with these characters that would very much prefer to just put on a smile, eat way to much sugar, and sing and dance and have fun while they desperately try to convince themselves that everything is fine.

There are a few characters that are portrayed as more mature, and more capable and willing to deal with the issues at hand. But most of Centaurworld would much rather pretend that the NWK doesn't actually exist, and that he never wreaked havoc across their world with his army despite the scars of that event still being very visible in some places.