Did the downvote bring your post to zero reward or below? If not then I don't consider it abusive, I consider it disagreement among stakeholders on the best allocation of rewards. If you look on youtube you will find that the trending videos have between 60-90% upvotes. I doubt the posters there are unhappy about it either. You can't please everyone but if you please most here, you are rewarded. As long as you got more upvotes than downvotes (weighted by SP) you pleased the majority. If that turns into a significant reward you should be happy about that (and you did better than probably 95% of posts)