They're mostly just doing it to piss people off and mooch laughs off of the trigger-finger press, and it's sad how well they're succeeding at it.
Also, please scan any files you may have downloaded from this user before using them.
Context matters, and the current context is that racists such as the Christchurch shooter are using the ok hand symbol and Pepe shit.
Belle Delphine is the online pseudonym of United Kingdom-based cosplayer and model Mary-Belle Kirschner, who gained much internet notoriety for posting videos and photographs of herself performing ahegao faces.
Also of tools related to the above.
For a more extreme example, the swastika was a Hindu symbol before Nazis started using it.
What matters is that a bunch of racists used it like it was, which makes it a racist thing.