When your goal difference is -3 and you've lost 7 games out of 16, it's not just one of those games. We've been toothless for a long time now.
Chances usually means a goal-scoring opportunities. Yes they got into good positions but were really poor in the final third. Bournemouth were composed, organised, pressed well and took their chances. Also it was United at home to a bottom half team. It wasn't good enough and you won't convince me this wasn't a poor performance. I don't think that's an over-reaction.