I hate black pepper. You know, the seasoning, that everyone in the world uses, that makes people sneeze? Yes. I hate it. And I hate it, I realized a few years ago, because I was conditioned, as a child, to hate it.
Here is a pro-tip for you: If you decide that it is a good idea to do DIY aversion therapy on your grandchild to get her to stop sucking her thumb by mixing something bad tasting into nail polish that is placed on her thumbnail, don't use a common spice that will be in her food for the rest of her life. Unless you want to be a dick, in which case, go for it.