Not that I mind that now and again people downvote a question or answer they don't like, but this looks very strongly like some kind of retaliation or personal attack.
Look at the activity here:
There top two downvotes happened a minute apart from each other, and the last three are also a minute apart from each other. And maybe it took even less time since the time display only goes down to minutes.
Clearly they are not actually reading the posts, they are just navigating through and downvoting as they go.
I don't know if I'm the only person this is happening to, so I don't know (or care) if it's personal or not. Whatever it is, though, it's unsuitable for the site, and I'd like to bring it to moderator attention.