No, he didn't forget.Did the author forget that the demihumans only accepted the MC because he's basically "one of the good ones?" Even the guards and leaders were willing to have dragged behind the tents in the magical favela and have him beaten to death by a mob.
But the reaction is different depending on the circumstances and age of the demi-humans and how long they've been mistreated by the Holy Kingdom's people.
Those who were sent to slave away at the mines or the refugees who traveled to the black forest who were all demi-humans and have been mistreated by the holy kingdom humans all their lives like children or young people would have that negative reaction to any human.
But you forget that it's been said the original Merinard was a mixed race nation. So there were humans living peacefully with the demi-humans before their subjugation 20 years prior by the Holy Kingdom.
Go back to chapter 38, page 12 where after conquering the forts, they have an influx of demi-human refugees from neighboring villages with "old merinard kingdom" human soldiers among them. That means those demi-humans who still interact or have contact with old merinard humans who don't have any kind of bigotry or racism have a lesser or no negative reaction to meeting other humans or acknowledge not every human is a Holy Kingdom human supremacist.
Since this is a manga it's limited in how much world building and info it can cram into it.
There are several POV chapters in the LN/WN where they show some the humans who lived in the old Merinard were coerced to work as soldiers or guards for the Holy Kindgom rule under the threat of harm to their demi-human families or neighbors and hold no love for the holy kingdom rule.
Quoting one such from one of the towns they liberate later in the story:
But now that my wife, my children, and the rest of my kin had been taken hostage, there was nothing I could do. This garrison was composed entirely of soldiers who were born here in Gleiseburg, and there wasn’t a single one of us who had any true loyalty toward the Holy Kingdom or to Adolism.
When I was still just a child, they burst into Gleiseburg like they owned the place. They hurt my childhood friend just for being a demi-human. They hurt the older boys and girls from the neighborhood who used to play with me. They hurt the older men and women. They said that because I involved myself with demi-humans, I was a sinful barbarian, and looked down on me for it. Those assholes could go to hell for all I cared
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