I flagged your comment as too chatty, and a moderator followed up by deleting it. From my memory and yours, your comment was (quotes included):
"Have you stopped beating your wife?"
The wife-beating bit isn't important; you were chiming in with something character-building related. It could've been "Have you stopped taking your vitamins?" or something else dealing with a relatively harmless topic.
Ultimately comments on main site are primarily for one of two things:
- requesting clarification
- suggesting an improvement
This was neither. At its simplest you were just chiming in with some kind of question-prompt idea, one could also surmise you might have been trying to hint at a point (maybe "there's some questions people would of course rather reject"?) but you never said that point, and comments aren't the place for making a point — answers are, so long as you're also answering the question.
It was a chatty comment that didn't add much and didn't do what comments are supposed to do, and had no reason to not be deleted, so I flagged it, and it got deleted.
There is no notification mechanism for your comments getting deleted. Comment deletion doesn't matter enough to get notifications about it.