Okay, anecdotes are often a biased sample, but as another poster said - "everyone I know" ...
When you get stuff like that, you *need* to find the explanation if you want to understand. I suspect that people who object to anecdotes are actually indulging in the very UNscientific pursuit of collecting only the evidence that confirms their prejudice, not the scientific pursuit of evidence whether or not it supports them. Indeed, true science is the pursuit of evidence that does NOT support you.
If you can't find any, then you can conclude you are probably right :-)