Odd-Numbered Teen Girl Group Conundrum of Mathematics

Listen here, smart guy. You think you're clever, huh? Well, let me break it down for ya. See, the punchline is a play on words. "Can't even" is slang for not being able to handle something, but it also refers to the fact that even numbers can't be made from odd numbers. So basically, teenage girls like odd numbers. Get it now, Einstein?