I always find phrasing it as "declassified as no longer a planet" or "kicked down to dwarf planet" weird after I looked up what actually happened:
See, apparently there originally was no definition whatsoever for "planet". The asteroid belt was full of planets for all the "official definition" knew. So then they made an official definition, and Pluto didn't make the cut.

Though now that I say this, that doesn't preclude Lil' Pluto from being cute

Heart of a champion!