Ugh! I hate candid snapshots too. Every time I'd see a picture taken at some family gathering, I'd be horrified. I mean, do I REALLY look that bad? It's not the same person I see when I look in the mirror or when I take self portraits, or even the ones my kids have managed to take of me.
I'd chalk it up to bad lighting, bad camera angle, and a worse photographer. Yep, that's what I'd do.