"When you feel confused, ask the person what they mean by that term. "
Yup. Some people are so arrogant and think they are so "smart" because they appeal to some piece of paper to license them to knowledge (PhD), and deny other valid definitions if we just look at the words closer to see what they mean, and how they can reflect reality in multiple ways.
Words have this power. Words can have dual meaning that sometimes oppose, I have found this in my etymological research.
For some people, if they don't like how someone uses words, to reflect an aspect of reality that they are not used to hearing the word used for, or to define it more precisely and more clearly, in one instance they say "Just because it has been used as such in the language it doesn't mean it is so," as to deny how the word reflects reality because they don't want to be corrected in their own limited definition of a word; and then in another instance where the definition can apply to something else in reality, they want to simply say that a broader use is invalid because they don't understand how the meaning can convey more than one aspect of reality.
Words are tricky that way. Sure, use a dictionary and etymology to point out he original meaning of a word as it was first intended to be used, but also look at how the word can mean more than that original meaning now, because words do change meaning according to the conventions of them being used by people.
Take care. Peace.
RE: Bringing a Dictionary to a Gun Fight! Why it Matters When We Redefine Words and their Meanings