Same issue if you ask people if they believe in God If you don't first define what you mean by "God" the answer doesn't have much meaning. Two people can believe in "God" but actually believe in totally different things. Conversely one person can say they believe in God, and the other person says they don't, but if they got into a detailed conversation they woudl find out they actually believe in the same thing (e.g. the second person thinks when you said "God" you meant the old man in the sky, and the first person thinks you meant the spirit of humanity).

This is not a complicated concept - i.e. defining your definitions, which should be related to the context of the question. So if people consistently don't do this, it follows that they probably have an agenda - e.g. to win an argument and crush their "opponent" - i.e. they don't really want to explore and learn from each other.

If you ask somebody to define a "woman", it's only a meaningful question if you indicate why are you asking the question? For example if you want to know if somebody "is a woman", why are you asking?:

1) Do you want to know what pronouns to use?

2) Do you want to have sex with them?

3) Do you want to tell them which bathroom to use?

4) Do want to know if they can give birth to a baby?

5) Do you want to know if they should be on a men's vs. woman's sports team? (and of course you would need define the purpose of having two different teams - which is different in junior high school vs. professional sports)

6) Do you want to direct them to a store to buy clothes?

7) Do you want to tear them apart and cancel them to satisfy your ego?

But of course, many people don't want to think too hard, they just want to satisfy their agenda. Sigh...