I don't really like social discussions as one of my problems is not having the patience to deal with people who don't recognize their privilege. I think in order for there to be a leveled discussion about a social issue, the person in the majority must first "check their privilege".
So (all of this in the context of American society) if the topic is race, white people must understand they come from a place of privilege. If we're talking about queerness, someone who is heterosexual and/or cisgendered should know they come from a place of privilege. The same is true for able-bodied people, upper-class (and sometimes middle-class) people, the religious--notably Christians, and even men.
Being apart of a majority--not being apart of a marginalized or discriminated group--means you have different experiences in our society. This is not to say that it is wrong! You cannot help having privilege. But as a person coming from these groups, you must know that your life is inherently different than someone who has been negativity affected by our social structures, even if you've never actively seen your privilege at work. Privilege works passively; it works through perceptions.
All this is just to say: as a person in a majority, have empathy for those who are not. Take a step back and understand where people come from, whether they are gay or trans* or poor or are of a racial minority. Don't discredit their experiences, and understand that who we are and how we are perceived in our society means we live different lives.