"Trolls" (or whatever) usually shitpost on NR to trigger people. On discord, it doesn't work quite well. 'They' want some attention. On discord, you may get a reply like "u make me moist" or something else. But on NR, a shitty shitpost triggers lots of people and makes them act all serious. This is want 'they' want. They want to laugh at your 'serious' responses.
You know how it is: Discord - everyone enjoys spreading shit and (almost) everyone's fine with that. Nilly's Realm has most people that act all serious and professional, get sensitive and catch the bait when they see a shitty shitpost (by catching bait, i mean attack 'that' troll back).
So yea, "ignore" is the best option for shitty shitposts. And by replying to shitty shitpost with something like "be my dad pls", you're encouraging 'that' troll to shitpost more.
P.S. - also people may not want to join discord because they're lazy.
But hey, everything i said is quite obvious, isn't it?