I don't know that I have a permanent aversion to Ginger Ale. Growing up, we only drank ginger ale when we were sick, and it was a good thing, a drink that always made us feel better. So I associated ginger ale with getting better.
Then, when I became pregnant, ginger ale and vanilla ice cream were the only two things that would reduce nausea. I drank a LOT of ginger ale...and now I don't like looking at it, even when I'm sick. Which is interesting, because it did make me feel better--it's probably just the excessive amounts I drank.
Hopefully, I'll get over the "ack! Not ginger ale! thing before I need it again..." but I've got a while, so who knows.
All my food adversions occured during pregnancy. I couldn't even look at chocolate, especially mint chocolate (my favorite) for very long without feeling ill for about five months or so (A horrific thing, since I'm a chocoholic, normally...). Happily for my emotional state (but not for my waistline), I can again eat chocolate with impunity.