Musk's 'breakup meme' tweet on Thursday night sent Bitcoin plunging
Panicked investors took it to mean Tesla is selling off its Bitcoin reserves
Musk mocked their fury with another meme of a crying day trader
Meanwhile Miami hosted largest Bitcoin conference of the year
Jack Dorsey announced Square will develop a hardware wallet for crypto
Musk was not on the list of speakers, and it was unclear whether he was invited
Animosity toward Musk was on full display among conference attendees