You have to bear in mind that, to me, improvements in literacy and consistent accuracy in matters of the written word were one of the keys that enabled the working class, previously shackled by ignorance, to escape from the depths of poverty in which we were mired for far too long. Numeracy holds a similar place in my esteem.
It was certainly my 'escape route' from the life that my background would otherwise have mapped out for me.
So it is a sadness and a matter of concern to me when, from my perspective, I see the standards of literacy collapsing once more amongst the very people who need it's aid the most.
If a joke such as the one in the OP can make just a few people latch on to the importance of language and it's skillful use, that really is a reason to smile and have hope for the future.