Attitude based off game mode.
This is a well known thing by almost anyone who has played long term and I am sure many people have varying opinions.
However the worst thing I can hear in a normal mode match is that it is normal thus it doesn't matter.
This attitude should be unacceptable in league. Doing silly builds, setups, or even comps is completely acceptable as long as your team understands that in select. The issue lies in the fact that some people do not want to attempt to win because the match is not ranked. Regardless of mode this should be unacceptable within the summoner code and an offense which can be reported. It is often difficult to tell how serious someone is taking a match if they do not speak up or act out in an obvious manner. In these situations I can't honestly say someone is not trying to win so long as they continue to assist the team in some way.
The only reliable way to mark someone for this is the famous line
It's just a normal game
This to me in any way shape or form is a sign someone is not willing to attempt to fight their way to victory with their team. This is someone who views the match at pointless and a waste of time. Yet there they are in game playing with you in that normal and being your team mate for that game. If players can be banned from ranked they should be able to be banned from normal for essentially not caring about it.
The overall topic is EXTREMELY touchy as they are often best described in a case by case basis. I feel that the community would agree that the general idea of not wanting to try and win because of the game mode is unacceptable.
TL;DR My statement here is that those who OPENLY admit they will not try because it is normal is unacceptable. Thoughts?