I think people need to realize that often when you hit with a white, that's a better option than running away to throw it, especially if they're at a high percent. If the white hits are done excessively and at any percent, that's when there's a problem. All oli critique videos usually involve someone saying "you hit with a white, watch your line". If they aren't out of hand with attacking with whites, that is horrible advice.
Anyway, play more defensively, especially against a character like dk. His size and speed make for easy camping. Also, many of dk's good moves (ftilt, dtilt, bair, etc) outrange oli's moves, which is just more reason to play defensive, since good grabs/pivot grabs will beat those.