plutophobe
1st definition: A person who hates Pluto and/or other dwarf planets.

2nd definition: A person who does not allow Pluto and/or other dwarf planets to be planets.

3rd definition: A person who does excludes Pluto and/or other dwarf planets to astronomy education stuff.
Some plutophobe from Internarional Astronomical Union: Pluto isn't a planet anymore.

Some Pluto Lover: Yes It is you plutophobe!