Is it possible to be grayed only on a single post?

I gently pointed out an error in the headline of a NeetzZim post. The comment pointing out the error was deleted by the author after the error was corrected.

A few moments later, I replied to a commenter on the same post. My reply was grey. It is important to note that the reply was grey as soon as it was posted, it wasn't demoted.

I then posted another comment on a different story, and that comment was not grey.

Any ideas what is going on here?