The ability to taste bitter flavors probably didn't evolve as a self-defense mechanism

Not really related to the article, but I don’t seem to have normal bitter receptors, except for when I was hiking in Scotland several years ago I bought a cheap bag of pine-nut based trail mix and for about a month thereafter everything tasted bitter. It was really confusing going from normally bitter things not tasting bitter, to water and sugar tasting vile and bitter. After a while I went back to liking things other people think are bitter, but the whole experience was eye opening. It makes me curious if that’s what other people taste all the time? I mean, if that horrible taste is what eggplant tastes like for my kids?