Honestly, if you think that some people can't handle the truth, then don't tell them. But from my experiences, my friends where fascinated by the fact that I practiced witchcraft, but that was only because I told them gently about the religion. The conversation went like this:
Me: 'Have you ever heard of wicca?'
her: 'You mean like Witchcraft?'
Me: 'Yeah, like witchcraft.'
her: 'Yeah, what about it?'
me: 'have you ever read about it?'
her: 'I heard a little bit about it, not much. Have you read about it?'
me: 'Yeah, I think it sounds interesting.'
her: 'Whats interesting about it? Isn't it evil?'
me: 'From what I read about it, they practice the same religion as the indians. They worship the earth and plants and stuff like that.'
her: 'Like hippies? But what about casting spells?'
me: 'I read that they only cast spells to help people, like healing spells and love spells.'
her: 'love spells? Really? Like i can get a boyfriend?'
me: 'well, yeah, but they have a law that you can't harm anyone, cause it will come back to you worse.'
her: 'Oh, I didn't know that. So wicca isnt evil?'
me: 'from the few books i read, no it isnt evil. I think I might even start practcing it. Would you still be my friend if I choose the practice witchcraft?'
her: 'as long as its not evil and your doing it to help people, I guess I wouldn't mind.'
And that was the end of our convo. We were still friends, and she even asked for a spell to help her mom through her chemo, which worked. When she told people, she would tell them like I told her about the religion, that it wasnt evil, but kinda like hippies. No one ever treated me like crap. I was able to wear my pentacle and talk about spells, I was completely free from the broom closet.
Try to have a talk with your best friend. Keep her interested, while slowly telling her that its not evil, that its earth based, and that you might be interested in practicing it.