I think that wine-making text is hooey. Or... wait... does does your airlock have a cover to keep flies out?
Fruit flies are a serious danger to your beer, but in the airlock is OK. I'd clean that airlock out and replace the fluid in it though.
What's in your airlock? And, why doesn't it have a cover for this reason? (If it does have a cover, now that might be a problem!)