Nah, it's just a joke. Nothing in there to promote bitcoin. Actually it just seem to acknowledge the belief that bitcoins are mostly used for criminal activity online.
The joke isn't about Bitcoin. The joke is that students carry their lunch money into school to buy lunch, so this is just literally sending any random money over the Internet. It's also about how difficult it is to force people to send money online, because people would be separate from the bully. Bitcoin is just a surface-level joke that the Simpsons like having more often these days to appeal to people who don't actually get it.
It's shocking that I have to explain this to people.
The Simpsons is pretty deeply satirical anyway, I wouldn't take any joke of theirs as a direct insult so much as pointing out how stupid the entire situation of doing that would be.
Well, The Simpsons are prophets. So they have the right to promote or make fun of these topics.
I'm really surprised how they predict Trump's position.
They didn't. That was around 2000, when Trump had mentioned considering running for President and it was a bit of a joke among people.
/nerd