Demeter and Hades are not close. Just like Zeus, Hera and Poseidon, Demeter sees Hades as pretty weird, frustratingly introverted and cold at times, but reliable and possessing some admirable qualities. I imagine that they once had a fight when they were younger and Demeter wanted Hades to return her dead lover Iasion to her, which Hades refused since it was against the rules and he had to remain impartial. But she doesn't hate him or anything like that.
He has imhis points, you can’t push for him to be social, but just just give him space. And he’ll be there for yah.