I don't get it, is it meant to be a joke about how the experts (most famously engineers) have terrible spelling (tbf in my experience it's more so the grammar)?

...or is the joke that the man in the comic thinks everyone on social media who talks about a subject like they're an expert is an actual expert which is seldom the case, despite the poor spelling giving away that they might be in fact just opinionated 14-year olds (or in a more contemporary sense accounting for birthrates likely senile 84-year olds)?

I was talking to someone and guess what, he was only one of a handful of people in the world to have a PhD on Polar bears.