For a company which makes films with certificate 'pg' or 'u', they've really taken advantage of this to get a message across to an audience which would normally shy away from the subject of homosexuality.
To show a younger audience that its ok to be who you are is a very bold move, but its so smart, young people look up to a company like pixar, everyone loves their film and everyone respects them, so to hear them talk about such a sensitive subject could really help people.
I can't think of any other company which would dip its toes into such uncertain area. Just goes to show how good pixar is, and how diverse they are.
Its a nice piece as well, giving comic relief where necessary then hitting you hard with stories which set off emotions which you thought only their films could set off!