TRUMP JR under investigation :), page-134

Spot on.

If you say that you have "no opinion" on a topic then proceeded to argue against another poster's opinion, you are in fact stating your opinion !

"fake obsequious over-politeness" - well done.

I'd been trying to find an apt descriptor for what is clearly a deliberately annoying positing style.

https://www.macmillandictionary.com/thesaurus-category/british/polite-in-an-unpleasant-or-insincere-way

As an aside (yep, off the topic of the thread), the mention of Flat Earth brings to mind that we already have a well established No Opinion poster there.

We don't need two.