In the context of his professional career, it is. Washington drafted him. What little time he had in the minors was in Washington's farm system. His professional debut was in Washington. Most fans don't care where he was born or went to high school.
Fans don't care. But he does. Fan don't count. He does. He doesn't consider DC to be his home town. That's what counts, we're talking about whether HE will give a "discount".