Where Tolkien was "coming from" isn't that straightforward .. certainly not the leftie working class, though he was something of an anarchist, and had deep sympathies with the "lower" classes (having been a bit low class himself). I don't think it fair to characterise Middle-earth as made merely to celebrate the aristocracy. In Letter #246 Tolkien detected a trait in Sam, the proto-typical hobbit:
a vulgarity — by which I do not mean a mere 'down-to-earthiness' — a mental myopia which is proud of itself, a smugness (in varying degrees) and cocksureness, and a readiness to measure and sum up all things from a limited experience, largely enshrined in sententious traditional 'wisdom'
but then in #281:
The story and its sequel are not about 'types' or the cure of bourgeois smugness by wider experience, but about the achievements of specially graced and gifted individuals.
This is not supercilious sneering, it is a comment on a specific trait, which is not central to the themes of the book, but which Tolkien clearly felt was part of the general English character, and not entirely to its credit.