Emacs

Yes - the only way to express disagreement is to compose a post.

[This is particularly bad on Facebook where an account is typically public with your real name, so reactionary blowhards spout their shit and the only possible resistance is from people willing to publish a statement against them. I find it ironic that (in my opinion) their requirement against anonymity significantly adds to the level of toxicity. But that's Facebook and Facebook should die.]

Superficially it could be argued this is beneficial, as you have to have thoughtful reasoned discussion, or something, but in reality when I see something I think is wrong-headed or toxic, I just have a dread of getting sucked into trying to fix "someone is wrong on the internet", and move on leaving them unchallenged with no sign of disapproval or disagreement, and I'm pretty sure my reaction is typical.

I find it interesting that, in my opinion, negativity (downvoting) and anonymity are actually positives for healthy discussion, contrary to many people's opinions and a common contemporary cultural view that only positivity is helpful.