Meh. I think the "meatheads=people with only HS diplomas" equation is facile. If you're speaking specifically about blue-collar workers, it's still pretty insulting, but you could probably make a better case with that differentiation up front.
Practically speaking, there is nothing sacrosanct about a college degree. It is the educational system, with its bureaucratic filtering mechanisms, elitism, and status-consciousness that has turned it into a humanist sacrament. Education need not be formal for it to be both valuable to the student and the society he/she lives in.
I think by "meatheads" GP means people who undervalue education on the basis of "I succeeded without much of it" (failing to understand the contribution of a particular social context to that success) and thereby promote a culture which undermines the context which allowed them to succeed. (The specifical example he gave was people with only a HS diploma, not people without one, but I think that example was, in any case, illustrative of the problem, not an exhaustive equivalence; nor do I think "blue collar workers" is the right generalization from the example.)
There's plenty of people (blue collar and otherwise) that succeeded with only (or even without) a HS diploma that don't undervalue education, and they don't meet GP's description of the meatheads he is talking about.
What does this even mean? Is this a Markov criticism, or do you really think US public schools don't teach kids about "social contexts"? From what I can tell, as the parent of a high schooler and a middle schooler, social contexts and algebra problems are the core of the curricula.
Practically speaking, there is nothing sacrosanct about a college degree. It is the educational system, with its bureaucratic filtering mechanisms, elitism, and status-consciousness that has turned it into a humanist sacrament. Education need not be formal for it to be both valuable to the student and the society he/she lives in.