Banana is one of those flavors that some people love and some people really hate. Others in this category -- lutefisk, kimchi, certain cheeses -- make sense: their distinctive flavor is associated with decay. Why bananas, though?
My grandfather was a banana hater. His observation on the topic: "I hate bananas, and I'm glad that I hate them, because if I liked them I'd eat them, and I HATE them!"
For those curious, it is not very boozy (maybe around 7%-10% abv), but very yeasty - to a point where it kinda numbed my mouth. For those curious the yeast is the dominant flavor, followed by banana. Very earthy taste.
Later on I saw Urwagwa sold in a can at the airport, it was very different, no yeast but bitterness instead. I preferred the homemade one.
I think I'm fine with them cooked, but not raw.
I don't know the mechanism, but if you do searches on bananas and headaches you will find people prescribing them as a cure for headaches, not the other way around.
In all seriousness though, I can’t stand overripe bananas. Bleah.