I find it very difficult to watch. My mother was a Hyacinth, she probably still is (and lives in the very area where most of KUA was filmed). My Dad married her because she was fun and he loved her and she married him because her big sister had just married and she thought she would end up "on the shelf".
Her family came from a working class bit of Camden and her brothers and sisters ended up as "The one with the tennis court", "the one who died from TB", "the artistic one who still lives with his mother" and "the one who married beneath her and lives in Hayes (the horror!)".
My mother was painfully aware of what she thought the neighbours thought to the point where she didn't care about her family, except as props for her middle-class life. If we fell short of her expectations she made our lives a misery.
My Father unsurprising left, so I see Richard as a bit of a saint as he's clearly fond of Hyacinth and stays with her.
Ironically, the neighbours were more worried about me than the state of my Mother's net curtains, and very kindly provided me with a refuge form her when I couldn't cope.
KUA is a perfect portrait of that sort of family, except that for the sake of comedy, Hyacinth's family are mostly tolerant. She is ridiculous, in fact, she's a monster: she is completely blind to her faults, and she gets to keep her friends and family when I know, that in reality they'd all be NC with her by now.
I'm not sure why you think Elizabeth is a cow!