In the comment section to this question post, I was replying to a comment of a moderator with a question and also posting another comment for the asker. The moderator apparently didn't like my question to him and wrote something like "how pedantic you are" (to which I responded that I don't mind if he doesn't mean what he says).
A few hours later all comments, including some comments of the asker and my comment to the asker, which were not related to the little conversation between the moderator and me, have been deleted.
I think that if he was going to retract his comments, he shouldn't delete the entire comments section. That's destroying content. Isn't he exceeding his competencies with this action?