My point is that Joe Blow off the streets who might be seeing the OP's tweet doesn't know (or care) that there's another, more niche definition - Joe Blow only knows "working class" as mainly people doing manual or unskilled labor (another term I see this problem with all too often), and "working poor" as the part of that class subsisting around or below poverty level.

So, if you're trying to get Joe Blow off the street (or pretty much any other regular person, for that matter) to understand, agree with, and support you, saying things that don't make sense, like "80% of Americans are working poor" or "unskilled labor doesn't exist", and then insisting that you're right when he objects, is only going to cause misunderstanding, and Joe probably does not care enough to learn the nonstandard definitions you think are better for whatever reason.

This isn't directed at you, but sometimes it's really not surprising that conservatives do so much better than socialists/communists at attracting working-class people to their cause, if only because they don't require a four-year bachelor's in the terminology of niche political theory to have a basic conversation with them.