Ways to combat casual transphobia and cissexism: 

• Do not gender strangers. Refer to people you do not know with gender neutral pronouns so as to avoid furthering the idea that appearance = gender. 
• Ask people what their preferred pronouns are when you first meet them. 
• Shut down people who say that genitals = gender. 
• Shut down people who use the phrases “two genders” or “opposite gender.” 
• Also shut down people who use the phrases “two sexes” or “opposite sex” to help our intersex siblings. 
• Avoid using phrases like “manboobs,” “mangina,” and “girl/woman boner.” 
• Discourage misgendering as a form of mocking or insult. Also discourage the usage of phrases like “you look like a boy/girl.” 
• Encourage others to also do these things.