And this is where we fundamentally disagree, I believe that any censorship of literally any kind is too much censorship. There is no such thing as a "reasonable standard" for banning "disinformation", because any two random people will disagree on what should be silenced or not.
As for where to draw the line, society always has to figure out where to draw lines on what behavior is allowed and what isn't. It's always a matter of tradeoffs, not some absolute principal with no exceptions. Society may very well go too far in one direction, and often has, but we still end up drawing lines somewhere. Hacker News certainly draws the line on some speech, because of a desire to keep the site respectful and on topic.
For Covid, I think the reasonable standard acceptable to a majority of people is to ban intentional spread of conspiracy theories with clearly false facts that discourage people from being vaccinated, or putting harmful substances in their bodies to combat the virus, which are not medically approved.
You're committing the slippery slope fallacy. That any kind of censorship leads to the bad kind of censorship, instead of there being a reasonable standard for banning harmful disinformation, and not just differences in political, religious or whatever views. Societies always have to maintain some kind of balance between individual rights and the collective good.