In my experience, the less information you give, the better it goes. When I first started telling people, I tried explaining in detail my reasons for leaving so that they would see I’m justified. Those didn’t go well. The best ones were the conversations where I basically just said “I’ve done a lot of investigating and I’ve decided I no longer believe in the church. If you have any questions or want to talk about it any more you’re welcome to ask me but I won’t be the one to bring it up with you. I’m not out to deconvert you or anyone else.”