Pluto is a great test for what type of person someone is.
If someone says Pluto is still a planet. They have a personality where they are immovable and can't accept scientific change and everything has to be how they first learned it.
If they do say pluto is a new kind of dwarf planet they are more accepting of new information and belive in the scientific method and love to be wrong. Since it means we learn something new.
Or the third option of they recognize that scientifically Pluto is a dwarf planet and no longer a 'full' planet, but they also anthropomorphize everything to an unhealthy degree and don't want to hurt the feelings of Pluto by saying it isn't a planet anymore
I recently heard that they discovered hundreds of Pluto sizes "planets" beyond Pluto, so they had to decided do we add 100 more planets or just demote Pluto to planetoid and ignore the rest