Lady refers to young women and is used in public, so before meeting, the host will say, ladies and gentlemen! Can't say women and men! Influenced by British culture, women in such countries usually want to stay young in the eyes of others, so they generally use younger titles. There is no difference between disrespectful and disrespectful. Women generally refer to female groups, and sometimes refer to unknown or unfamiliar women. It is often used in the third person. There is another special usage of woman, that is, it is followed by a noun indicating occupation to indicate women who are engaged in this occupation. This usage does not apply to ladies.
Oxford vocabulary