Ironic flaming?

Why can we have provocative skins and champions who literally strip/pole dance with lines of dialogue about using 'void staff' as a dildo, but I can't say 'thanks' ironically to someone without it being considered negative behaviour. The game is rated as 'moderate' so 15+ right? Surely a 15 year old isn't going to break down because I said 'ty' when he R's himself as zilean instead of me.
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