I think you're both right: * someone reacting strongly to this slight difference is "acting like a baby", at least colloquially, but I'm not sure if it meets t

I think you're both right: * someone reacting strongly to this slight difference is "acting like a baby", at least colloquially, but I'm not sure if it meets the author's definition of "active". * the author using the term "acting like a baby" might get through to people who are sensitive to the difference