Dude, Cocomelon is in a league of trash all its own. I literally think Barney & Friends is better for a child's development than Cocomelon, and that is not an endorsement.
And that's why people remember the world and times being simpler when we were kids. It's not that the world was simpler; it wasn't, and it never has been. It's that we ourselves were simpler.
While Mom has a point, it might drive the point home better if she gives "18yr old me" a reality check. Being a grown-up doesn't mean you can do whatever you want. It means you can't. It doesn't mean more freedom. It means freedom is something you remember having when you were a kid.