We no longer use the word 'class' in everyday conversation. If we need a substitute we may say 'socio economic group', usually referring to the lower classes. It is so interesting to me that as a working class person, many of my contemporaries think of themselves as middle class. Times have changed.
A word like youse used to be referred to as a class marker word. I don't know what the modern non offensive word might be. I very much dislike the word youse. It sounds so..........common. (Being a little self critical, it seems like I believe that you can be working class but not common. Quite possibly so. I don't mid being working class but I would hate to be thought of us common) It would seem youse is also used in Britain and North America.
I would argue that a clear plural of you is needed. You is both singular and plural but at times it does not work well to describe the plural. If a good part of the western world is using the word youse, we do need a plural of you.
An inventor of clever words is Snoskred. What word might she come up with? Perhaps the deep south of the US has it right with y'all.