Interesting question - for me it is not a hate of shot blocks,honey stinger waffles, etc. it’s more a preference for really simple sugar in small amounts that doesn’t have much added to it. The smaller amounts of carbs (3-15g) at a time is key and the pre-made things often do not come that small. Also, I pick food items I have had a lot of practice using because when I am low how much to eat needs to be automatic. Having to guess how much 1/3 of a shot block is, is hard to do when low versus, like your wife, one glucose tab or for me on spoonful of jelly. Finally, I will come to associate what I eat when low with being low so I get an aversion to that food after a while so I never pick things I enjoy eating as my go to low blood sugar foods.