With regarding to raising awareness and breaking down people's stereotypes, I find it more useful to tell people after they've got to know me a bit rather than straight away. If you tell them straight away, they can simply delegate you to a convenient category in their head, but if they've got to know you first, then they will have to adapt the category to incorporate what they know about you, and any ways in which you challenge their stereotype. Also, when people know you, they feel freer to ask questions, which is the best way for stereotypes to break down.
To give an example, one friend said to me after I'd told her: 'But you have a sense of humour - I thought people with Aspergers didn't have senses of humour.' So then that gave me opportunity to talk about humour and the different kinds, and about Aspergers. But if she hadn't known me, she'd never have said that, and also potentially never would have got to see my sense of humour, because she'd have been looking for things to fulfil the stereotype.
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'If the shoe doesn't fit, must we change the foot?' Gloria Steinem