I like arguing with reddit.world but I have a terrible sickness, no one should be like me!
I don't actually believe online debate works. So, if you want to agitate, it has to be nonconfrontational at its core. Once there is conflict people just get dug in to the preexisting notions, and because online discourse is so depersonalized there can be no way to bridge that gap. At that point you're just another random encounter in the posting RPG.