like i know these people are technically meant to be our allies because they don't own the means of production, but how the fuck do you spend more than my family's annual income on fast food? how are we meant to find common ground with people who are able and happy to do this? 
edit: turns out this is a repost. sorry. but still, i standby my disgust
They aren’t a different class. Those people still don’t own the means of production and are hence working class
Yep, class is a concept built on what reproduces society, in our capitalist case that means how you interact with production. There might be some highly specific classes, technically, but those will be reduced to their simplest forms when the tensions of the society are heightened.