Just in case anyone was still waiting for some cites that use sexism to mean the institutionalised subordination of women:
Code, Lorraine. What Can She Know: Feminist Theory and the Construction of Knowledge. Cornell University Press, 1991.
Page 64: a brief discussion on the dictionary definition vs other definitions.
Kassin, Saul M., Steven Fein, and Hazel Rose Markus. Social Psychology. Cengage Learning, 2010.
Page 147 “Sexism […] institutional or cultural practices that promote the domination of one gender over another.”
McCann, Carole Carole Ruth. Feminist Theory Reader: Local and Global Perspectives. Routledge, 2003.
Page 41: “Her oppression endured by the forces of racism and imperialism is similar to that endured by our men. Oppression by sexism, however, is hers alone. (By sexism we mean oppression based on sex, just as racism is oppression based on race. Sexism includes both social structures and attitudes of male superiority that are rooted in those structures.)”
Ruthven, K. K. Feminist Literary Studies: An Introduction. Cambridge University Press, 1990.
Page 2: “The oppressive effects of patriarchal domination manifest themselves as ‘sexism’.”
Worell, Judith. Encyclopedia of Women and Gender: Sex Similarities and Differences and the Impact of Society on Gender. L-Z. Volume Two. Elsevier, 2001.
Page 873 defines sexism.
Here is a PFD of Marilyn Frye on the definition of sexism. All about cultural and economic structures and dividing the world into dominants and subordinates.
There is:
Benatar, David. The Second Sexism: Discrimination Against Men and Boys. John Wiley & Sons, 2012.
The author comes up with a new concept, “second sexism”, as a descriptor for gender discrimination against men. He indicates that this is necessary because the definition of sexism is institutionalised gender discrimination that oppressed women.
This is really just a very quick look through google books, searching for the term “defining sexism”. I just wouldn’t want this thread to end with anyone thinking that ladyfoxfyre’s claim is unsupported.
Anyway, which definition the mods use doesn’t matter. They are enforcing the “don’t be a jerk”-rule. That means that they look at whether someone is being a jerk. The difference with before being that there is more recognition of the fact that many women don’t find being a jerk funny just because it is being a jerk to women.