It's probably because we're brought up to think of it as posh and not for the likes of us.
You can break down most of these taboos but some are bound to remain.
Great mixed audience over here for this kind of stuff, ballet can be a working mans sport.
I put on a shirt instead of my rugby jersey but that's about it.
You'll see folk in jeans and jimmies and folk wearing tiaras, makes no difference.
Of course at the nutcracker there's a fair amout of kids, little girls all dressed up, all exited about Christmas Eve.
I like it.