Kids are little bastards, it's because they're kids and in the early learning stage.
Most grow out of it, some carry on being a bastard in later life too.
If anything they're worse now than they've ever been, mainly in the big cities.
If you think you can change them......good luck.
Children are not born racist.
Children are not born sexist.
Children are not born homophobic.
Children are not born trans-phobic
etc etc etc
But if they see older children and adults behaving in a particular way, they will copy that behaviour and it will become innate because they don't know any different. Then they go and replicate that behaviour and the whole sorry story continues.
I have two friends, one is a cis-woman, the other a trans-woman and they have a delightful little daughter who is very intelligent. One day she was outside and a little girl from a neighbour's house met her and they started playing.
Suddenly the other girl's mother came rushing out, dragging her daughter away saying "No, we don't play with her!"
That child is going to be brought up with the idea that two women (especially if one is trans) are people to be avoided, simply because her mother is a bigot.
Another example: there was a series on the BBC not long ago called "No more boys and girls" where a Doctor went into a Primary School class and changed the way they were taught, getting rid everything from gender separated coat racks to the teacher calling boys "mate" and girls "love".
The boy had an over-exaggerated idea of their own abilities whilst the girls were much less confident, but by the end of it, the girls were more self-confident interested in STEM careers etc and the boys behaviour was much improved and they were considerate of other people.
See
https://www.standard.co.uk/stayingin/tvfilm/bbc-documentary-no-more-boys-and-girls-asks-if-genderneutral-schooling-is-the-key-to-achieving-a3613406.htmlSo it *is* possible to stop children being little bastards but we need to start by making sure they don't *learn* to be little bastards!