I noticed that this kept happening when Berlin had a mayor who happened to be gay. And remember how often we heard and read words along the lines of "Barack Obama, first African American president of the US bla-bla-bla"? As if we were all colour-blind.
Do you think not pointing it out all the time would have made these politicians' race/sexual orientation appear a pink elephant?
What you may not understand is that the press here in the US, which is rabidly liberal, is the one doing the labeling of people. They promote it. You won't hear the man on the street preface politicians or anyone else with their skin color or sexual orientation. I keep warning foreigners about the biases of the US media but no one listens. Maybe Neal for Long Island can help me out on this one.