One thing that confuses me about the Dursleys is how they're supposed to be a parody of the British middle class, but isn't Vernon like director/chief of a company? Like, he owns a business and it doesn't seem to be a failing one so wouldn't they be more accurately described as upper class? Maybe it's just me who's dumb but it's something that really confuses me lol
thank you very much for the ask, anon!
the dursleys would never be thought of as upper-class, because that implies a certain aristocratic or gentry connection which they evidently don't have.
the most they could be is upper-middle-class - which is one of those fun british class-brackets which has a very specific "look" in the wider cultural imagination, and which defines itself as something vastly different from being middle-middle-class or lower-middle-class in terms of its vibe.
which is to say, this intra-class division isn't really financial [although that is a factor - just not the only one] so much as it's based in performance. how one changes social class [which is possible, these class divisions aren't immutable] isn't by becoming rich, it's by learning how to perform. mundungus fletcher, for example, could be a billionaire, but the way he presents himself to the world would still read as working-class. the teenage voldemort has nothing in his bank account, but he behaves in a way which is indistinguishable from his posh pureblood friends.
the dursleys' class performance - the way they dress and speak, the way they behave, their attitude towards their possessions [such as vernon's pride in his car], the places they want to go on holiday - indicates a bang-in-the-middle vibe, simultaneously aspirational to someone like petunia [who grew up below it] and hilariously unimpressive to someone like james potter [who grew up above it].
the best illustration of this is to compare them to the grangers, who are clearly upper-middle-class. the financial difference is negligible - vernon, as a company director, could feasibly be on a salary which was in the same ballpark [or which potentially even exceeded] what a dentist who only or mainly took private clients [which is the case for many dentists in the uk] could expect to earn - but their performance of class is totally different.
the grangers go skiing and spend their summers in the south of france; the dursleys' ideal holiday destination is majorca - which, while this is very unfair to a lovely bit of spain and the lovely people who live there, is used by jkr because it has that sort of middle-tier association in the british cultural imagination [posher than going to the costa del sol, rougher than staying in a converted farmhouse in cantabria]. the grangers name their daughter "hermione" - which, whether they get it from greek or from shakespeare, is a statement of their class performance - while the dursleys name their son "dudley" - which is the same.
and - of course - the grangers are dentists, which means they went to university. vernon makes drills - but is not an actual builder; which, while a blue collar job which would be understood as working-class, is also understood as something authentic - and clearly did not.
the interesting thing about the dursleys' class-status, though, is that vernon seems to have gone down from a childhood which was upper-middle-class. not in the same way as the grangers - apparently city-based, europhile, undoubtedly voted for tony blair in 1997 - are upper-middle-class, but in a way specifically associated with posh people who live in the country - whose poshness is considered to be more parochial and more politically conservative.
marge dursley - with her tweed and her bulldogs and her brusque manners - is a perfect stereotypical example of this. so too is smeltings, the fee-paying boarding school which both vernon and dudley attend - it wouldn't be unusual within the dursleys' class-bracket for dudley to be privately educated, but it is unusual for this to be at a school with the vibe that smeltings [whose uniform, for example, is so obviously based on that of schools like eton and harrow] has.
it's really interesting to think about why vernon might have ended up shuffling down to the middle of the middle, especially because there are plenty of careers for a man from that country-posh bracket which would retain his class-status without requiring a university education - above all, going into the army. that he doesn't do this - that he becomes a managing director, a job which has financial but not cultural cachet as an upper-middle-class signifier [if you care about these things - which i do not] - has a certain degree of deliberate choice behind it.
and this provides a fascinating comparison with petunia - who was clearly raised working-class and has ascended into the middle through performance, and who then becomes desperate to retain her status by continuing to perform "correctly". vernon also lives behind a mask, which also depends on the correct performance of a class-bracket which he wasn't born into, even if his class journey is one of descent.
vernon and petunia's fear of magic relates to this - they're both terrified that the neighbours will learn, if they discover the existence of magic, that they're not as bang-in-the-middle normal as they claim to be.
and this is fundamentally because magic is something eccentric and strange. and eccentricity [especially in dress and manners - the thing that vernon hates about wizards] is read as either a sign that someone is very posh or a sign that they are very much not.
but not as something in between.