I think the root cause of confusion is that the reviewer took "Report" to mean "Report User". A simple fix would be to change the button to "Report Comment" or

I think the root cause of confusion is that the reviewer took "Report" to mean "Report User". A simple fix would be to change the button to "Report Comment" or "Report Comment as Objectionable Content". To me this actually makes the interface more clear because honestly when I see "Block User" and "Report" I'm not completely sure that we have gone back to talking about the comment after the first button is talking about the user.