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How to tell if someone is a poser
Look for excessive showing off.
A poser will use any chance they can find to show off the thing they're " obsessed " about. Look for stickers, apparel, and other items that relate to what they claim to love.
For instance, posers within the car scene will cover their cars in stickers as a cry for attention. If that backpack or t-shirt from a popular comic book is brand new, but the wearer claims to have been a fan forever, you might have a poser on your hands.