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Start fighting back. Derail their threads, make it impossible for them to get off the ground.
Post roll images, post dubs, Garybomb their popular threads, start hunger games, complete Exodia, remind people of who is starting these genwar threads, and remember to always sage.
And if the mods delete our attempts at self-moderation while leaving the discordfags' threads up, don't let anyone ever fucking forget their selective moderation.
P.S. If you want their bait threads and posts deleted, good luck, but if you want to try it anyway, report them, but be smart about it. Stuff will most likely get deleted if you report it around 1PM to 9PM EST every day. If you report posts outside of that time range, shit usually never gets done about them. Additionally, you should report their bait for "Participating in or instigating a flamewar" or "Trolling outside of /b/", those reasons work best in my experience. "Spamming/flooding" may also work in specific circumstances, but using "This post is extremely low quality" never gets a response, so avoid it. The more a post gets reported, and the more different reasons it gets reported for, the more likely it is to get deleted.