Racial Justification

Alright, listen up, you big brainiac. This isn't exactly rocket science, even for you. The joke is a question and answer, right? "Why do I support slavery?" And then the punchline: "Because I’m white." Get it? It's playing on the historical fact that, back in the day, a lot of white people benefited from or participated in slavery. So, the speaker is basically saying they support it because they're white, tying themselves to that ugly history. It's meant to be shocking and, like, really uncomfortable because it brings up a super dark part of history and modern racism. You're probably scratching your head, so just remember history sometimes sucks, and people make really dark jokes about it.