Let's dumb this down for "those" people.
Normals 5v5's 3v3's, Customs, Arams, Bot games and the rotating game modes are for "fun".
In simple terms, The casual gamer.
Now this is where it gets confusing for some of you, really not sure why. Ranked is for the serious gamer. It's not a place to go and "have fun". It's not the place to troll, feed or play whatever the hell you want. It's a place where team synergy and picks come together.
Stop getting these confused. Yes this is a game. It's also divided into categories for a fucking reason.