I think it's really as simple as the OP said. "Having servants is not American." Well, why should Catholics care about the Liberal and Protestant cultural sensibilities of United-Statesians ? French culture has a tradition of hierarchy and it is not opposed to the virtue of humility to employ assistants to help one better perform one's duties. It is a Protestant and humanist and liberal error to claim that egalitarian social attitudes coincide with virtue.
As for the rest...
But ironically this French obsession with food appeared after the Revolution with the appearance of restaurants to serve the emerging middle class.
That depends on how you define this "obsession" with food. The preparation and dynamics of food are vital parts of Louisiana Acadian and Créole culture as well and, as far as I know, always have been. It seems to have more to do with the influence of so many feasts and the spirit of conviviality and hospitality than it does with bourgeois pretensions or anything like that. Now, the classic XIXth-century French café is certainly the outcome of the unhappy tumorous growth of the middle class, as is the classic Parisian restaurant culture that now prevails throughout the metropolises of the so-called Western world, but fine dining was always in the homes of the nobility. It was simply that eventually somebody realised that they could profit by selling the dining experience of an aristocratic household to the merchant class who could afford it. This of course exploded after the Revolution, since the middle class exploded (metastasised ?) with the mechanisation of French industries, but even in the country side and in former French colonies, there is still an attention to food preparation and traditions that I think most Anglophones would find to be confusing (and enjoyable).
High standards and fancy dishes came to the fore and eatng there has become an art and a science and one of the seven deadly sins!
I agree that the spread of formal restaurants is a serious problem for society, since it means that there is a public service culture that caters to urban customers, something that I find to be symptomatic of social corruption and disorder. But I don't think that this means there is no place for the art of fine cooking in society. What about feasts or special occasions or receiving guests ? And surely nobody here thinks it to be a crime for the upper class to employ professional chefs or for there to be cooking guilds, right ? A craft should be performed well and a man should take pride in his work, no ?
To an Englishman, of course, happy with a meat pie and a pint of ale, all this is rather unmanly ...
Normans, Bretons, Québécois, Acadians, and Louisiana Créoles (not the African kind) all have meat pies. Amongst Louisiana Acadians, men know how to cook and are very proud of fidelity to concepts and techniques. This originally developed due to two things : First, because the men would bring their cattle down to the salt marshes to feed in the winter time and would join together to make gumbos in a common pot and, second, because they had to feed themselves when hunting waterfowl at their hunting camps (within the past one hundred years, many Frenchmen in South Louisiana fed their families through hunting and trapping). Anyway, I have never understood why men knowing how to cook well is considered unmanly, maybe because I have this tradition of men cooking in my family (not that women don't do most of the cooking, of course). The Anglo custom of men being totally inept in the kitchen seems really silly to me, especially when one has the opportunity to excel in a discipline that truly is an art form. It's not for pretense but for that sense of pride that a man gets when he knows that (i) he made something and that (ii) he made it well.
... and when coupled with French priests is rather suspicious!
I know it was a tongue in cheek comment, but I think that this is ultimately what this is really about. Protestant culture is not equipped to justify natural and supernatural hierarchies and has therefore eroded them to such a point that they are abhorrent to the sense of any self-respecting Anglo -- or they are considered utterly ridiculous, the butt of jokes and the source of endless psychological diagnoses. In the archdiocese where I live, for almost 140 years the prelate's title has been simply "Archbishop." "Your Excellency" is considered silly and arcane, even disgusting. I can't help but think that ultimately all of the anti-French and anti-servant rhetoric is rooted in the same evil soil that grow weeds like calling an archdiocesan ordinary "Archbishop" to his face, as in, "It's very nice to meet you, archbishop," before shaking his hand (of course it was not an honour to meet him...).