We might distinguish between
Reaction: I read your post and these are the thoughts it generated in me
Reply: …and these thoughts seem relevant to what the post was talking about
Rebuttal: …and they contradict what you said.
I’ve sometimes received comments where I’d have found it helpful to know which of these was intended.
(Of course a single comment can be all of these in different places. Also a reaction should still not misrepresent the original post.)
We might distinguish between
Reaction: I read your post and these are the thoughts it generated in me
Reply: …and these thoughts seem relevant to what the post was talking about
Rebuttal: …and they contradict what you said.
I’ve sometimes received comments where I’d have found it helpful to know which of these was intended.
(Of course a single comment can be all of these in different places. Also a reaction should still not misrepresent the original post.)