I always find the assumption that quick reactions are "bots" a bit weird. If I click on an active discussion, some comments will be "0 minutes" old (like yours right now, although it won't be when I submit this comment, because typing takes time - but downvoting doesn't). If I click on "comments" tab on HN, all comments there are new. So it's not particularly surprising that many people see your comment very shortly after it is posted on an active site like HN and react to it immediately.