I wouldn’t put it past an awful lot of people given the stupidity I see on a daily basis.

Pluto is a strange relic that basically got considered a planet only due to the time and method by which it was observed. It was speculated that the perturbations in Neptune’s orbit indicated there was another body beyond it which everyone naturally assumed to be a planet. Clyde Tombaugh looked in the location where such an object was believed to be and found Pluto. It was assumed that this was indeed the planet in question.

Pluto was the first thing of its kind that was discovered, but it turns out that there are a lot of things in the solar system that are about the size of Pluto or even larger. And Pluto is too small to be the thing that was actually influencing Neptune’s orbit, whatever that may be. We just didn’t observe any more of those planetoid bodies until later. But after doing so, that would require us to either declare there are dozens and dozens of planets or, the slightly more sane avenue, come up with a more specific definition of what a planet actually is, which by necessity also excludes Pluto.

All the hype about is basically just down to people refusing to change what they learned in elementary school. But the thing about science is that it changes and is refined over time as we gain understanding of the universe and how things work. This is what makes science science. Anything less is simply dogma.