Do you remember how in old Solarballs episodes the rocky planets used Pluto's name as mockery? And a lot of people assumed they were bad friends? Which is honestly valid, because it seemed like they only cared about his status as a planet.
But in the last arc, we had seen Pluto with the gas giants and all of them semingly cool with Pluto and act very happy to see him as an old friend. Which is pretty contrasting compared to the rocky planet.
And now that I thought about it, Pluto and the rocky planets most likely weren't friends to begin with. We know Sun doesn't like when the planets leave their orbits. And Pluto's orbit is billions of kilometers away. In planets ordered by size arc Mars says that the rocky planets and Ice giants tend to forget about each other because of their distance. Pluto is even further away for the most time. Taking this into fact, the only time he would really be able to interact with the rockies was if the Sun had gather all planets for some reason. And I doubt it was a everyday occurrence. For the rocky planets Pluto probably was just some very very distant planet that barely crossed their minds until his demotion
But as Giants are much further away, interacting with them would be far easier. I'm even going to say he had a huge advantage in being small here, because it's harder to notice him move out of his orbit if he ever did. And with this, Pluto could have much closer relationship with them.
