Not offended by this.
It's at worst a photo-opt. I'm not seeing the whole, "I'm Rosa Parks" angle that some of you are.
I have pictures of me in Philly in the room where the continental congress met. If I show them to people on the Fourth of July does that somehow mean that I think I'm John Adams or am trying to co-opt his legacy. Nope. Just would mean I was there and honored them.
I actually like this picture, Obama owes Rosa Parks and all like her for the very opportunity he had to become President. They changed the mind of America which opened tangible doors in his life. It's a powerful and symbolic photo.