@WhitestTemplar @TheMadPirate @Ghislaine Yes. Pics related, as memes in their essence are about conveying ideas without additional explanation.
I don't think the left is incapable of understanding or using sarcasm, but that they are not able to allow themselves to fully use it without first worrying about having the "correct" opinions, as their ideas are all formed through consensus rather than independently. Which is why they rely so much on "authoritative" sources for their ideas.