Earlier quoted context omitted.
It is prudent to make decisions based on evidence though. Not just something you think might have happened to you.
Well, when you're not supposed to be doing a universal study, what happened to you is your first line of evidence. If all scientific evidence says oranges are harmless, and you eat one and have to puke, then you'll avoid it, and rightly so, based on your empirical observation of 1.
You can't always do a large study, but when you're presented with one it doesn't help do give anecdotes in response.