Is it normal to change subjects immediately after you finish your story, or is it controlling?

Someone I was talking with was telling me a story about some friends they had in their past. Once they were finished telling their story, they didn't wait for me to make any comment about their story. They just changed the subject without allowing a moment's silence to pass first, by asking me what I had for lunch today. Is that controlling or normal behavior? The conversation topic wasn't anything too serious, but still, it made me not have much sympathy for her when other times she's always talking about how lonely she is, as if she'd wait a few seconds, I might have added extra minutes onto the conversation with my own comments.

Is it normal to change subjects immediately after you finish your story, or is it controlling?
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