Off the top of my head: The Apprenticeship of Duddy Kravitz, Sullivan's Travels, much Martin Ritt (Norma Rae, The Molly Maguires,Stanley & Iris,The Great White Hope up to a point), Dodsworth (in some ways), perhaps some Astaire-Rogers films, certainly the underrated Mitchell Leisen's The Mating Season :John Lund marries classy Gene Tierney, is sort of ashamed of his mother who runs a hamburgeria. Latter played by the really great Thelma Ritter. If the list gets extended to non-English-lang films there is a plethora of titles. In France --off top of head again-- many 1930s films, esp. of the Popular Front period. Several Renoirs: Grand Illusion, Rules of the Game,the neglected Boudu Saved From Drowning (and its US remake Down and Out in Beverly Hills), A Day in the Country, La Bete Humaine (the murdered rich older man took advantage of his femme-household staff),The Lower Depths, The Golden Coach (lowly thespians and colonial rulers), and on and on. =46ilms of Marcel Carn=E9 like Le Jour se Leve, Children of Paradise (the Count), et al. Feyder's Carnival in Flanders.Carne again with Bizarre-Bizarre (as farce), etc.etc. Rene Clair's Le Million (in a small way),A Nous la Liberte (in a bigger way), The Ghost Goes West (satirizes wealthy Amer. nouveaux riches, Les Grandes Maneuvres to an extent. Duvivier's Pepe le Moko, Truffaut's Shoot the Pianist, Blier's Too Beautiful for You. Getting tired.So much depends on the definition(s) of "classism," on whether it is the main subject, a sub-topic or a more or less delicate hint. If no Ph.D. dissertation exists on this, someone ought to become rich (?) and famous with this subject.