I have no idea what class I am...
Interesting that few people have answered with what "makes them working class", and are more likely to answer with what "makes them NOT middle class".
So far, being middle class seems to have been defined here as being workshy, dirty, scruffy-housed, "cocky", and wasteful. Oh, and that tired, old "Waitrose, lol!" line.
What a horrible attitude to have. Doesn't seem to be much actual pride here, just reverse snobbery and spite.
In my experience, you could always tell the self-identified "working class" people because they were the most class-sensitive and vocal about class systems, picking apart behaviours, possessions, and appearances to see who fit and who didn't. Meanwhile, the "middle class scum" they reviled didn't seem to notice, care, separate, or judge them in return. Must be all that elderflower cordial from Waitrose, eh?