“Remember to look up at the stars and not down at your feet. Try to make sense of what you see, and wonder about what makes the universe exist. Be curious, and however difficult life may seem, there is always something you can do and succeed at. It matters that you don’t just give up.” Stephen Hawking
Most dishwashers have only one heating element, and it’s at the bottom. So putting rubber or delicate things in only the top rack actually makes sense.
It has to do with trying to prevent UTIs @MrGrimm888 which females are far more prone to. The idea is to wipe away from the anus rather than dragging bacteria toward the urethra. :D.