My 17-year-old son zero interest in riding.
My 15-year-old son has a Honda CRF250X dirt bike and wouldn't be caught dead on my scooter and doesn't even want anyone to know I'm his father when I'm on it. Because, you know, scooters aren't cool.
I think this is all perfectly normal. Scooters don't become cool until you realize comfort, riding enjoyment and fuel economy are actually more important than what other people think.