Why do some people deny gender?
The only person denying gender is you. By asserting that gender is the same as sex you are perverting its meaning, you should know better by now. The definitions of sex and gender have been explained to you countless times. You have chosen to remain ignorant and you have chosen to continue your campaign of dishonesty and bigotry. You are not a man in any meaningful sense. Your complete lack of respect for others shows that you have absolutely no self respect.