Earlier quoted context omitted.
At first I didn't like the news. Tim Cook is gay, so what? I though 5 seconds about it and then I realized how actually we still need this... we still need to remind people that there's nothing wrong with being gay. That's sad that we are still at this point.
While I agree it's a positive thing for him to talk about, I don't care much for the way he's phrasing it. What does it mean to be "proud" of something you are ? Isn't that what we criticize white supremacists and other bigots for? Take pride in the things you do, the things you create. My only reaction to someone who takes pride in his or her race, gender, religion, or sexual orientation is quizzical indifference.
1. As a signal that you embrace your own identity, and are not ashamed of what you are, despite societal prejudice.
2. As a signal that you see yourself as superior.
Most of the time when you hear someone say they are proud to be gay, or black, or otherwise proud to be member of some other minority group, it is 1 they mean. Sometimes it is 2, but it is fairly rare.
Most of the time when you hear someone say they are proud to be white, it means they are white supremacists using it in form 2.
While it is certainly possible for members of majority groups to use it in meaning 1, it is incredibly rare, because it makes little sense: The point of using it in that form is to counteract prejudice. Pretty much the only members of majority groups that consider it necessary to counteract prejudice are racists that are paranoid that they are being pushed aside.