Slavery was also an event that happened just the same as the Holocaust.
Wrong. “The Holocaust” refers to a specific event, while “genocide” refers to a concept that has repeatedly occurred throughout history. “Slavery” refers to a concept that has repeatedly occurred throughout history, not a specific event. Perhaps “American Slavery” can be used in a similar fashion.
The words “death, shot, gassed, burned, cremated, murdered, genocide, brutality, beating, mass grave” etc. are not anti-Semitic or specifically referring to the Holocaust.