I have to agree about the meme, it shows a sort of arrogance of the "haves vs. the have nots" and is beneath the Bitcoin movement. It smacks of tribalism.
I've never said "have fun" to real have nots. That would really make me a jerk, which I believe I'm not. I've used that expression a few times, however.
It may smack of tribalism, but I think it's the right thing to say to people who could have, and still could, get some corn - because they have both decent information and fiat for investment on their hands. They will always choose some other asset because tulips, because afraid, because too expensive, because whatever. Explanations or conservative advice (such as "just throw 3-4% of your fiat at it") won't budge them.
What else can you say to people like this?