>2. Who is the arbiter of "social trolling" versus simply a different opinion?<
Currently, it seems to be the rabid left/feminazi/green/homosexual/globalist/humanrights Theocracy Cabal of Evil..
>Having a society where there is social trolling, is certainly better than having a society where social trolling is disallowed.<
Yes, it's a safety valve.
>What kind of mechanisms would allow that and how could they look any different from despotism<
There are no difference!