He may well resent his wife being only interested in Voldemort, but if he does he's smart enough not to make that public. And nah, I think Bellatrix is a special case there. I figure the sexism is just not entirely consistent - women taking active roles is frowned upon, but not unheard of. And Narcissa's presence at the meeting may be more because she's the host than because she takes an active role as a Death Eater.

Okay.

I mean that you seem overly fixated on the unhappy memories aspect of the Dementors. For Harry the memories of his parents' death is of course the worst part of a Dementor attack, but even if someone had no unhappy memories at all, such an attack would be traumatic - the cold, the feeling of helplessness, the feeling that there is nothing good in the world anymore.