I am not a native English speaker and I have sometimes referred to people as male and female (as that is what I have been taught) but I have received some backlash in some cases, especially for the word “female”, is there some negative thought in the word which I am unaware of?
I don’t know if this is the best place to ask, if it’s not appropriate I have no problem to delete it ^^
Depends entirely on how you use it. There are many perfectly valid uses for the word, like in science or on a checkbox where you select your gender. The point where it can get offensive is when referring to individuals or groups of women as “females” where you could instead just use “women”. It’s language often used by incels and the like.