Normals does not mean don't try and win.

Sure normals is a place for a more relaxed environment. Off-meta champion testing, personal new role experimenting/practicing, experimenting with new champions, etc... No where does it imply that you can just not try and win. Have fun toy your heart's content, but at least try to win the game.

Normals is not a free pass to purposely throw a game out of spite for a team mate either. Purposely throwing also includes selling all items for a completely new build of 6 or 6 or 6 etc... Also deciding at 50 minutes that you actually wanted to try AP Talon or full tank Sona out and rebuild for it leaving you with 3 items and some components is also purposely throwing.