Six things to remember when discussing gender

I tend to have mixed feelings regarding these sorts of issues, so I made this list to sort out my feelings and possibly help out other people:

1. One's sex does not determine their role, nor does one's gender expression determine their gender. Telling someone they should act a certain way because of their genitalia is stupid. Telling someone they should identify a certain way because of the way they express themselves is also stupid. If someone who presents himself femininely says he's a man, respect that. Same goes for women who present themselves in a way that is more masculine.
2. Gender identity is an individual thing. Say there are two male-bodied people who present themselves femininely. One of them may still identify as a man, while the other may feel more like a woman. Either way, it's not your business.
3. Being transgender doesn't make you a special snowflake, and being cisgender doesn't make you a conformist. 
4. The determining factor in one's gender identity should not be related to looks, behavior, or interests. This is a mistake that many people make.
5. Gender is difficult to define. Maybe one's assigned gender just feels weird to them. Or maybe they feel okay with more than one gender. That should be the deciding factor in one's gender identity.
6. Cisgender and transgender people will not have the same experience, even if they have the same gender identity. To act as if they are interchangeable not only undermines individual differences, but also ignores the reality of gender discrimination.