She mentioned that people have commented, "Nobody would say they were 'religious but not spiritual,'" to which she was like, "Uh..."
I said, "I am totally 'religious but not spiritual.'" I don't "experience" in worship. I have a strong commitment to Christianity, and I make a commitment to attend communal services (though I don't tend to think of this latter one as a conscious choice, such a creature of habit am I), but my commitment has always been and continues to be a primarily intellectual one.
My best friend commented that she has committed to a set of practices, including communal worship, which frequently do not result in spiritual experience, so the "spiritual but not religious" person might come across as saying, "Hey, I have spiritual experiences all the time, all by myself," which might be experienced negatively by someone for whom spiritual experiences are rare.
Whereas my reaction is more like, "Oh, that's nice for you that you so easily have these experiences which I don't have any strong desire to have" (there's an asexuality analogy here somewhere).