there's a huge, fundamental difference between silence and (very) low quality discussion.
silence totally blocks progress.
low quality discussion, if continued persistently, is actually fine.
why?
in programming terms:
b/c the low quality discusser is exposing an API with various convoluted, messy, buggy, misnamed, falsely documented functions which people he's talking with can access.
but give a good programmer a shitty API and in general he'll find some kinda universality and make it do whatever the hell he wants. he'll find some way to get a NAND out of it, to manipulate bits and so some very basic tasks. and then he can define his own API on his own computer on top of the shitty API and use that. (i define on my computer a sequence of calls to your API which make it do some useful task. i repeat for several basic tasks. then i build up another layer of stuff on top of that. then i do what i want in that higher level meta-meta-API i made. so then i'm shielded by layers of abstraction from the low level mess. it's a lot like how some of x86 assembly is old messy backwards compatibility junk, but a javascript programmer never notices.)
universality is so easy to come by, even with a very limited array of bad functions.
another analogy is a hacker will simply find a buffer overflow in your API and then root your system and be able to install whatever software he wants.
what stops the meta-API approach or the security hole approach? silence. you can't get anywhere with an API that stops answering queries. you can't root a box that ignores all incoming requests.
if you're dumb but persistent, good discussers can figure out what you suck at and what can work, and start to focus in. they can try a variety of things, learn about how you block them, and then keep trying new workarounds (each time either discovering a new block or directly making progress). they have something to work with, like a puzzle to solve.
but if you're silent, they can't do a damn thing. if you keep dropping discussions, they can't help you.
persistent bad replies make a WHOLE WORLD of difference, vs silence.