Although anecdotal evidence is of interest, it does not trump solid research. For example, it’s possible that those who skip the shot every year haven’t ever had the flu and just might have a yet to be identified natural anti flu edge over those who elect to inject. So, Year after year they don’t get the flu (until they do get it). They then think the shot isn’t necessary. But that is a false assumption. Also, people who inject may think it gives them super power immunity, so they are careless and expose self to flu sources. They then get the flu. Doesn’t mean the vaccine doesn’t work. It may simply mean the vaccine lowers the odds of getting the flu, but less effective if you assault yourself with flu exposure. The flu vaccine is a killed virus, not live. Except the nasal spray.