Sure, people have taken the matter way too personal. That's mostly people who have a nostalgic relationship to their childhood classes about "the 9 planets".

As I've read, they made the definition in the particular way to remove gray areas of inaccurate meassurements. A celestial body shouldn't be wrongly classified due to being a few kilometres larger than some limit, then be reclassified later due to better meassurements. Planets need to be somewhat spherical, orbit a star and clear their orbit from significant debris. They made a great system which doesn't leave big gray areas. A planet is defined in a well thought out way by people way smarter than me.

And then they go and call the non-planets "dwarf planets".