Tony:
Sorry, but they're right. An N=1 sample is meanignless. Just because .01% of the population doesn't get the flu or the shot ( or .1%, or 1%, or even 10%) does not mean that the shot does not help. Even in those cases where people develop flu-like symptoms after recieveing the shot, they are of shorter duration and lower intensity than if they had gotten the flu.
If we're going to rely on personal experience, I can shoot your argument down. I've been a medic in the military for several years. It's a requirement for servicemembers to get the flu shot every year. The latest was for our COmpany in Iraq (about 200 people). Those who got the flu shot did not get the flu, and only one of the flu-shot group got ill at all (a minor, single-day illness that passed quickly). We had some who did not get the shot due to being away on missions or medical reasons. We had three of those catch the flu, which developed into pneumonia, with one requiring hospitalization twice during the course of illness.
Of course, even my sample of 200+ people who were operating in similar conditions at the same time is not statistically significant. That was the point people were making. Your experience does not encompass a large enough sample of the target group to be a reliable guide. Neither does mine. It is exactly the same as claiming a blue rock works as a tiger repellant, because none of the people you know who carry blue rocks have ever been attacked by tigers. It's also similar to claiming that a red shirt attracts lightning, because a person you knew got struck by lightning while wearing a red shirt.