" I do not understand why u are talking about arguments."
Because you made an unsubstantiated claim.
" I just said that you confused gender with sex. "
Which is a claim - not an argument for a claim.
" Definition of concepts can be different in your imagination as I see. "
It has nothing to do with concept or definition, but of epistemology. and yours apparently comes from popular, subjective, and arbitrary,cultural opinion.
" Concept is concept, not a theory that needs an argument. "
Concept means that you have conceptualized or can conceive of something in the mind - that you can says nothing about it being true - and yes - a concept does in fact require an argument - otherwise it's just a fantasy.
" If you wanna use term gender to refer to sex just use sex, why use term gender? "
I'm glad you asked. Sex is the biological make up of an individual and gender is the behavior associated with it. However, one necessarily assumes the other - IF you have a sound epistemology to ground you in objective reality. Progressives thinking that men and women can identify as any gender they want - or not at all - is solid evidence they don't have a solid epistemology. Let me know if I can assist you further.
" You are using a context to critisize or make fun of something without proper structure. "
Which is yet another empty claim based on your assumed position - not an argument for it.
" Anyway, just wanted to let you know I find it strange with using gender with "
Given the fact that you assume something as true that you can only conceptualize - but not argue or provide evidence for - I'll bet you do find it strange - but that says more about you than this issue.
"Have a nice day."
You do the same.