When an opinion is deemed a "threat to democracy"

You're conflating democracy (a system of administering elections) with constitutional republicanism (a system that creates and enforces laws)

Any political movement that exists in a constitutional republic must abide by the standards established by the republic before they can be allowed the protections afforded by democratic elections.

The only one that's confused here is you, bucko.

I am merely pointing out the hipocrisy of those that support banning certain political opinions that they deem to be a "threat to democracy". They are the ones conflating the two, not I.