I find the

quite plausible. Consider what happened:
*
LuckyCharms' FB friend posted a grossly obviously satiric meme;
* Bunches of people "got it" and "Liked" it;
*
MarshmallowBrain was too damn dumb to recognize the grossly obvious satire, thinks people he hates are "Liking" "fake news", and wants FB manglement people
something-or-othered for allowing "fake news" to be posted.
I seldom use the pejorative, but
ChuckyLarms truly is a DUmmy,

!