It's not about it being different.
The whole purpose of them was to teach girls how to be girls and boys to be boys. That is the very raison d'etre of fairy tales.
They are as much of a teaching tool as any other. So unless you are explicitly told that they are not representative of real life and just a story, then why would you realise it?
Imagine what a child sees during a day:
EG...
An episode of The Tweenies where they visit a bakery and learn how bread is made.
An episode of Fireman Sam where they learn to listen to adults and not play with matches.
An episode of something educational where they learn a maths concept.
A fairy tale where they are shown how boys/girls behave.
Dismissing it as fantasy doesn't work because even the He-Man cartoon finished off with a moral or a lesson every episode. Stories are used as a way of teaching children so you can't be confused that they learn the lesson within.
If it weren't generally accepted that these were a problem then there wouldn't be more subversive versions written (e.g. Paperbag Princess) where these norms are intentionally rejected.
When my son was about 3, his dad and I did something together to fix something. My son said, "well done daddy, you're a hero". His dad said, "your mum did it too. What about her?" and the reply was, "mummy you're just beautiful".
You clearly had a different experience, but no you cannot deny the experience of others.