Why do so many think they deserve a higher rank just because they killed a few high rank players playing casually in unrated/spike rush/replication/ DM etc ? So many posts/comments about how they are doing well in the casual modes but are...

I play late at nights since that's usually when i have time to grind ranked. I just had a game where I am in the lobby, trying to get some comms going. No one answers for about 40 seconds. I get comms with a few seconds left after everyone'...