My 6 year old daughter now screams the chorus to Mr Brightside from the back seat and I blame myself
Last month on I-95 outside Richmond she asked me why I always turn it up so loud and I didn't have an answer, so now she just does it with me. My wife says we look ridiculous, two people yelling about jealousy at a minivan full of soccer gear. What song did you accidentally pass down to your kids?
Everyone acts like this is some big meaningful thing but the kid is just copying you. That's what kids do. She sees you having fun with a song so she wants in on it. It's not that deep and it's definitely not a problem. If anything you should be glad she's into decent music instead of whatever garbage is on the radio now. The wife calling it ridiculous is the real issue here. Yelling in the car with your kid is one of the few free fun things left.