In real life, Americans may keen about income inequality. But on TV, they’re keen for it.

“Downton Abbey” continued its upward ascent with viewers Sunday night, a gushing embrace of class snobbery that hasn’t been seen since friends clustered across the country in 1981 — wearing black tie and clutching Teddy Bears and champagne glasses — to watch “Brideshead Revisited.”

I’ve resisted the “Downton Abbey” fervor. My grandmother and her nine sisters were tall, strapping women who immigrated to America from Ireland in the second decade of the 20th century and found jobs as maids, cooks and nannies for rich families with names like Gore and Mellon. So heaven forfend that I would enjoy watching Lord Grantham erupt in horror when his youngest daughter wants to marry the cute Irish chauffeur.

At the start of the fourth season, Maggie Smith’s caustic Dowager Countess still can’t stomach calling the Irishman by his first name, even now that the widowed Tom Branson is the estate manager and father of her great-granddaughter (dubbed a wicked “crossbreed” by the nanny.) As my great-aunts worked tirelessly to grasp shards of the American dream, they were not gliding about mansions playing confidantes to malleable employers, much less co-conspirators in moving the bodies of dead lovers.

It was a much tougher life than the democratized fantasy shown in “Downton Abbey.” Sure, Julian Fellowes’ servants have to iron the newspapers, choose cuff links and scan for scratches in the silver candelabra, but basically the upstairs-downstairs hierarchies work in contented concert, mingling like family — warmly and sometimes spitefully.

Just as there is a yawning gulf between “Gone With the Wind” and the harrowing “12 Years a Slave,” there is a yawning gulf between the Panglossian PBS soap opera of manners and the dehumanizing life most servants led.

In “Castle Rackrent,” an 1800 work that was a pioneer of the historical novel, Maria Edgeworth skewered her own British landlord class for viciousness to the Irish peasantry. Speaking of the grand lady of the house, Edgeworth wrote: “She was a strict observer, for self and servants, of Lent, and all fast-days, but not holidays. One of the maids having fainted three times the last day of Lent, to keep soul and body together, we put a morsel of roast beef in her mouth, which came from Sir Murtagh’s dinner, who never fasted, not he; but somehow or other it unfortunately reached my lady’s ears, and the priest of the parish had a complaint made of it the next day, and the poor girl was forced, as soon as she could walk, to do penance for it, before she could get any peace or absolution, in the house or out of it.”

Niall O’Dowd, the founder of The Irish Voice, IrishCentral.com and Irish America magazine, asserted: “For this generation of Americans, the ‘Downton Abbey’ ‘Yes, m’Lady’ servants are the equivalent to the old minstrel shows on the Bowery. It reflects the colonial cringe, casting an ameliorating light over a period that was full of pretty desperate stuff for people trapped in a rigid, notorious caste system.”

We believe in upward mobility. Yet some of the new American moguls are taking on the worst traits of the old British class system: Silicon Valley’s up-and-coming tech titans who complain about having to look at the tatty homeless spoiling their San Francisco “utopia.”

I relented on “Downton” when I read Alessandra Stanley’s review in The New York Times last week pointing out that the allure “isn’t Anglophilia or a vestigial yearning for a monarch” but the fact that it’s a “show about class differences that panders to contemporary notions of democracy and equality.”

Watching the saga from the beginning this week, I saw the extent of the subversive fantasy: The servants rule the masters. The bad ones manipulate the lords and ladies into doing their bidding. And the good ones instruct and nag their superiors into making the right moves in their royal lives, both personally and professionally. In Sunday’s season premiere, Lady Mary frostily informed Carson the butler that he had overstepped the mark in urging her to move past her grief over her husband’s death and get more involved in running the estate. But she soon humbly apologized for having the cheek to criticize Carson’s cheek. The marble beauty in long black gloves melted into sobs in his arms and then bucked up to rejoin the world.

The butler did it.