We knew that the pump-and-dump schemers of the crypto world were stupid – but sometimes we're still flabbergasted by the idiocy they display on a regular basis on public forums such as Twitter. This week, the crypto grindset bro that most, well, ground our gears was a certain Gavin Mayo (@EarnMayo), who got roasted to a crisp by users of the bird app. See, he thought it would be impressive to share a video of a lighter he had dropped an insane $7k on. “I spent $7000 on a lighter today. We are n…