No matter what your ethnicity someone on 4chan will make a joke about genociding you. The difference is that some people in the world actually are doing genocides. And someone from one of those groups, knowing that, is going to experience those jokes differently.
4chan, (and to a serious degree, HN) places the duty and the transgression on the person who has the bad experience with the genocide joke. But a completely valid model is actually that no, the genocide joke is the transgression and the one making it the transgressor.
4chan is not separate from the world it is part of it. And by fostering this environment you're providing cover for atrocities. Because not everyone is there just to have a fun time saying slurs! Some of them really do want us to die, and 4chan isn't just a diversion it is an actual site of conversion and radicalization towards their goals.