Agreed, MissA.
VS there have been numerous points made on this thread, but they have been ignored.
People are not 'just saying bullies will be bullies'. They are saying that trying to bring everything down to a 'phobia' of some kind is counter-productive to an understanding of human dynamics, and that blaming adults for children's bullying is simplistic. Children may learn a lot from copying adults, but they are not entirely innocent - or if they are born as such they learn survival early on.
Whether or not they hear adults making 'trans slurs' (and I think it is far more likely that they learn those from one another and from online and social media) they learn their behaviour. Adults are hierarchical (schools most definitely are), they are competitive, judgemental and often quite unpleasant. They interact with one another in various ways, not all of which are setting the best example.
If you are looking for ways to prevent adults from being a bad influence on children, you are going to have to find ways of changing human nature, I'm afraid.
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