I believe the distinction is that if you or I are accused of sour-graping Bitcoin, we cry crocodile tears on the internet, but if Bitcoin bros aren't taken as serious thought leaders of the future world economy, they stand to lose a lot of money, potentially leveraged.
It's a sexist term that degrades the countless amounts of female Bitcoin investors as well as those who identify as trans or POC. I'm surprised it's allowed on HN.