This doesn't explain why all of my posts get downvoted at the same time, including posts that are entirely unrelated. A 100 point karma drop where before my posts were contentious but still mostly positive is an anomaly that should not be explained away so easily. Bear in mind that it's not an either/or thing: people can downvote and upvote my posts for legitimate reasons, which is fine, while others block downvote, which is not fine. You can acknowledge the existence of block downvoting while still disliking my posts, that's totally ok.