Name some things you think are bitter in taste

I believe I have discovered an odd occurrence that quite a few people don't actually know what bitter is

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(is more sensitive to bitterness)
Ethyl alcohol.
Key Limes (the smaller the lime the more bitter it is).
Decaf coffee. (it takes a lot more to roast decaf than it does any other)
Flan, tiramisu. 💜 (bittersweet but still)
Poorly made Kimchi.
Certain catsup/ketchup.
Spinach, kale...
...
I think I'm well aware of what bitterness is...