This seems like a rather random rant (that seems to be jumping all over the place).

I don't think that anyone in this game looks down on casuals. I think you're largely making up an issue that doesn't exist. I'm a casual and never see anyone talking down on casuals.

The only time that casuals are ultimately brought up is whenever people are complaining about specific content catering to that group of people, but the complaint is the catering, not about casuals. Casual just is what it is. Everyone knows there are good "casuals" and really bad "hardcore" players.

I also play alone most of the time because I'm typically watching my daughter and can't afk in the middle of the dungeon because she decided to go swimming in the cats' water fountain. The game does a great job at providing "single player" options. So, again, I have no idea what idea you're trying to convey.