He was trying to avoid folderolling a thread and his own thread is suffering the same fluffy fate.
Could you explain the highlighted group of words.
I'm not sure, but here's my guess:
Traditional songs often use nonsense syllables to make up the metre. Examples are 'fa-la-la', 'tra-la-la', 'hey-nonny-no'.... One of these traditional nonsense phrases is 'fol-de-rol'. Possibly 'folderolling a thread' means adding posts to a thread that do not add to the useful content'
'fluffy fate' is another phrase that is new to me. Possibly it's analogous with 'fuzzy logic' - logic that is ill-defined and not rigorous.
So, if my guesses are right, your sentence means "he didn't add his comment to one thread because it was irrelevant to that, so he opened a new thread to discuss his point. And his thread received irrelevant posts from people who didn't follow the same principles of 'good netizenship' [i.e. like 'good citizenship', but on the Internet].