I think some people also think that homebirth stories are going to include bizarre details that they just don't want to hear. I've had that feeling before. I think some people feel like having a baby at home is like peeing in your living room. You just don't do that. It's gross and messy, etc...
And, there's probably some truth to the fact that they expect your story is going to "one-up" every one else's, and no one likes that either.
Oh well. There will hopefully be other chances to slip in a word or two about the benefits, safety, and joy of a homebirth.