Could someone who downvoted explain their disagreement? There seems a kernel of truth here that more than a few of us could agree on.

I think I have attracted someone’s ire, that seems to happen to all or most of my comments within a short window after posting.

This happened to me for awhile too. I think people that disagreed with you on a previous post are using bots to downvote you.

This would surprise me given the fairly high karma minimum to downvote.

Make a new account every time you reach the threshold, add it to the bot list.

Yeah, I thought of that, I was just thinking that surely someone able to create sufficient karma to do something like that would necessarily also be unlikely to be petty enough to bother.

Maybe I am too charitable.

You can gain karma fairly casually by just using the site, you get 1 karma per comment, so it's easy to make it a passive activity.

The site has also been around for over a decade, lots of opportunity to accumulate.

That and, everyone doesn't want you to have any way to uniquely identify them and contact them right up until the moment they forget their password.