A person who believes thier gender is superior and says unair things about the other gender, or assumes that only one gender has a certain trait. Both woman and men can be sexist.

-To discriminate(openly or privately) based on gender,
- Attitudes, conditions, or behaviors that promote stereotyping of social roles based on gender.

Noun: One who views their gender as superior to the other. This can go from men to women and from women to men. (maybe from men to men and women to women?)

Adj: Being discriminatory in some way against a gender.

Someone who practices discrimination based on gender. Can also be used to describe a thing, like a policy or a rule, that discriminates based upon gender.

(Sexists are not gay. (I am not saying gay people cannot be sexist. I am saying that sexists are not gay as a general rule.) If you say that it makes you a homophobe, which is not that different from sexism (in some cases no different), and no better.)

judging someone by their gender

All of the so-called definitions of feminism on urban dictionary.

A person who thinks that one gender is better or superior than the other. Often mistaken for feminism.