I am intersex, and it is not a gender at all. It is a sex: babies can be born male, female or - rarely - intersex. It varies a lot because intersex is an umbrella term for a wide variety of conditions.yup and pretty sure intersex people aren't a "inbetween/3rd gender" pretty sure they are either male/female with mostly one type of characteristics from one of those sexes and they are born with an anamoly like testes in a female for example.
But generally intersex people hate hate hate being used as a debating point by TRAs who think our existence is some kind of perfect gotcha to use in an argument.