Dungeon makes me think, punishment, lack of agency, hopelessness and misery.
Like being in an oubliette.
I think this is an interesting point (and it overrides my fear of posting in here)
BDSM appears to split into two groups, the dungeon club scene where the emphasis is on sensation play and themes of physical violence and threat, and I'd include knife/needle/blood play in this.
Then there is the domestic, verbal control type of D/s, to which the idea of a "dungeon" is out of place, and annoyingly the Shades of Grey film perpetuates this narrow image of domestic D/s by associating it with fantasies of abuse. When really it follows exactly the same principles of love, communication and care as any other relationship.
(I'm sure there are other ways of identifying this, I'm not intending to exclude any one group)
I don't feel comfortable about being associated with the whips and chains group, yes I'm taking on the usual vanilla predujuice in reacting this way, but nobody outside of D/s sees this identity as valid anyway and it's just something they feel quite happy about openly rejecting. Even the other day someone said this isn't what nice people do.
The concept of a menacing black dungeon just perpetuates this stereotype I think.
The fact that vanilla people use this section for hypocritical titillation just makes it a non safe space regardless of how anyone defines their kink. But labelling D/s as something that somehow requires a dungeon isn't helpful.