@UnicornSaysHi First of all, they both grew up with Prejudice and Discrimination.
Harry and Hermione have arguably had a much rougher time at Hogwarts from a social standpoint, both being discriminated and insulted because of who they were and where they came from. Harry had to battle with the constant pressure of high expectations and hate from Malfoy and resentment from Snape, while Hermione had it even worse, constantly being belittled with insults such as "mudblood." For this, it was not difficult to imagine these two feeling more alone and distanced from the rest of the Hogwarts student population.
On the other hand, Ron, being from a pure wizard family, never got to experience any prejudice or discrimination except on a few occasions for being poor. Ron also had a large and loving family with three older brothers and a younger sister always close to him at Hogwarts.
