People who identify or present as intergender/non-binary/androgynes/genderqueer, i.e., as neither male nor female, often appreciate being referred to using gender-neutral language.
"Person" can be used instead of "man" or "woman", and "Mx" can be used instead of "Mr" or "Ms". "Sir" and "Ma'am" can be avoided.
As for gender-neutral pronouns, here is one set: