I also did received a downvote. All the downvoted posts were posted on dTube; there's a whole ordeal currently going on with dTube, and I guess that every dTube post are receiving those downvotes.
It sucks, but c'est la vie. It's not about you (or me). I would guess that the project won't stop downvoting dTube posts anyway, so better just move on and stop using dTube altogether.