Why does flex 'not count'?

Everyone tells me flex doesn't matter Guy picked graves adc 'it's only flex I can troll' feeds 'oh you're doing well in flex, too bad it's not solo queue' 'It's only flex, why you taking it so seriously' What do you mean it doesn't count, why doesn't it count? I play solo in flex because I got dropped in gold, I'm not playing through silver (shudders) in solo queue, I hate that rank, I've already done it 3 different times on other accounts, I don't want to do it again it says ranked doesn't it?
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