Being honest this kind of ticks me off! Also full disclosure, I don't eat a bunch of Peanut Butter and Jelly sammiches anymore, but it's an institution.
Even more disclosure - I DO eat Peanut Butter and Mayo sammiches on occasion as it is delicious! (Real mayo too, not that Miracle Whip stuff) Don't judge till you try it. LOL -first open your mind, then your mouth - fantastic! Let's break it down - Peanut Butter? - Good! Mayo? - Good! Bread? - Good! What's not to like?
But the decline of the classic PB and J is a sad commentary indeed. We all grew up on them, and they have a special place in our hearts!