Maybe best not to joke about that.

An enthusiastic and muddle-headed person might get inspired by disposable Internet chatter, and then go and get themselves sent to federal prison (or worse).

Also, I suspect that an attack like that would only justify (or be used as a pretext for) additional actions that are undesirable to the perpetrator.

Maybe best not to even reply to such jokes. An enthusiastic and muddle-headed person might be a contrarian and might get challenged by disposable Internet chatter to not do something and still do that and get themselves in trouble. Staying silent is the timeless strategy of having no effect on the world