Yes, it’s a fantasy game, but the difference is that femdom and sissy humiliation are just kinks, while racism is a very real issue with real world harm. Fictional content can include all kinds of extreme elements, but that doesn’t mean everything belongs everywhere.
Raceplay is fundamentally different because it reinforces real world prejudices. It’s one thing to enjoy a humiliation kink, but when that kink specifically involves degrading people based on race, it stops being "just fiction" and crosses into something much worse.
And about "looking into myself and why I got triggered", recognizing when something is harmful isn’t being "triggered", it’s just having basic awareness. Maybe you should take a moment to look into yourself and ask why you think accepting racism as "just part of the kink" is normal.