system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 - Why is it when people are racist towards say Asian, or African people they are labelled racists, but against Jewish people it’s called anti-semitism?
gpt
Part of the issue is that the Jewish identity isn't just a race. It's also a culture, a religion, and an ethnic group all at the same time. Because Jewish people traditionally only marry other Jews, and the religion doesn't have a tradition of actively looking to convert people, most Jews are descended from the same ethnic group. But not all, as some people marry into Judaism. And there are some converts, just not many.

So it's not 100% an ethnic group, some Jewish people are from a different background. 

Judaism is also a religion, but it's also the culture associated with the religion as well, and some people who are Jewish may not be religious, but still consider themselves Jewish because of the culture they were raised in. 

This is all a way to say that Jewish identity is complicated enough where a separate word to describe bigotry against them is necessary.