In my experience with the game so far I have noticed that you do not lose rank from losing competitive games. The only time I have lost progression on my rank is from quitting (I didnt really quit, the game crashed and registered it as me quitting). Im not sure if this is a bug or if this is just a way to satisfy all players instead of the ones actually winning games.
Has anyone had a match that you lost and it dropped your rank? Not a match that you were kicked out of or quit. IM ONLY SPEAKING ABOUT MATCHES THAT YOU WERE ABLE TO FINISH BUT DID NOT WIN.