There's a very good video on this [1] by Innuendo Studios on why this discussion is more or subjective, since it matters in what context you say it and what you mean by it.
He does this with the example of a tomato, which by botanical defintion is a fruit. But in culinary terms, it is a vegetable. So when someone says "haha, did you know that a tomato is actually a fruit", it's subjective and can almost have no added value in a discussion. Botanists know it's a fruit. Cooks know the taste of the tomato and will use it accordingly. Hence, nothing is gained. Except confusion and unnecessary discussion.