Prior to the launch of the new Code of Conduct, there used to be fewer flag reasons available for comments. Like -- "No longer needed", "Rude or Abusive" etc.

Now, there is a new reason called:

"It's unfriendly or unkind"

Which kinds of comments exactly are to be flagged using this as the reason?
In other words, what kind of comment other users should make to let it be flagged with this?

I'm asking because it's pretty close to "Rude and Abusive" and also because the definition is somewhat vague.