Well, if you post a comment that is critical about posts of a certain category (e.g., specific-trade posts) in a post that falls within that category, it is more than reasonable to interpret that comment as being critical of the post, even if it is written in "general" terms (i.e., regardless of whether you also meant it to apply to other posts about specific trades). If you didn't mean it to apply to this post specifically, you would have started out by saying something like, "Although I think this post is good and valuable for reasons A and B," OR "Although it might not apply to this specific post," . . . "generally I think [specific-trade posts are bad for reasons X and Y]." Otherwise the reasonable (indeed the only reasonable) inference is that it applies to this post too. If you say that your comment was not intended at all as a criticism of this post, then despite finding that hard to believe I guess I'll have to take your word for it, but in context it seemed like a pretty straightforward criticism of it to me. Also, nothing wrong with criticizing someone's post (lord knows I certainly do that sometimes). I just thought your criticism (which wasn't even a criticism, apparently), wasn't fair or helpful. I don't think he "crossed the line." I just think his post was unfair to the author and detracting from the conversation.