its in reference to a mincraft server, 2b2t.
the server is based in anarchy, thus has no rules or bans (unless you're actively trying to break the server/game). pretty sure it's been around since 2011 or something with no map wipes. the background in the last panel is 2b's decimated spawnpoint. the CHAZ's anarchist community will eventually wind up in the same condition.
he was also likely aiming for an "in minecraft" joke, suggesting violence "in minecraft" instead of advocating the inevitable violence/chaos that's bound to happen in the CHAZ under anarchist rule.
Unironically used it once I sperged too in voicechat much about a disgusting fat asshole in my neighborhood.