@iamstan is well in his right to down-vote you for personal reasons.
It's all just a part of curation process.
Some people up-vote what they like, other up-vote to get curation rewards, and, some down-vote what they dislike.
If it wasn't meant to be used, it wouldn't be put in place.
Truth, however i choose to use my voting power for good rather than cause havock and troll. If i see spam or copyright infringement im going to flag.