It's generally quite easy and quick to spot sniping posters. They invariably have a lot of opinions and very few (in any) ideas. And in the most reductive cases their "opinions" are merely snipped pieces from their rag(s) of choice.
Even todays pisspoor "AI" can spot them a mile off. Proving, I guess, that it takes one to know one.
Regardless the best approach is to merely ignore and not engage. They will soon get bored (In "AI" circles, getting bored means you need to change your input model, by the way).
I have a feeling the mysterious message on the previous thread may have been promoted by one of the posters reporting it to MNHQ going "bwa bwa bwa, those nasty people never respond to my posts. Bullies" coupled with a very overworked and stressed moderator who didn't have time to RTFT.
Obviously all and any can post what and how they like.
I suspect things may heat up a bit in the next few weeks ahead of the great UK internet debate shutdown coming in March.