I donated to Warren and my wife is pretty much still committed to voting for Warren and is a social worker. She's 36, uses social media less frequently than me, and I don't think I've ever heard her complain about Bernie Bros probably because she rarely watches cable news.
I've no idea if you're even white, but god damn the only people I have heard complain about Bernie Bros are generally well off white people who at at least 45 if not outright boomers. They're savvy enough to use social media and just cannot fathom why he has a rabid fan base or they do absolutely no research of their own outside of listening to media pundits who cannot stand the fact that they get ratio'd on twitter. I try not to be a dick unless I know for a fact someone is being disingenuous and wouldn't ever vote for Bernie (usually never-Trumper conservatives), but for so many of us, and there are a lot of women who get nasty as shit on twitter in defense of Bernie, this isn't some game. This is real life and death situations and we aren't going to move forward enough, especially with climate change, with little steps.
I've said this before, I don't care if you don't vote for Bernie and don't want to vote for him in the general because we were the ones who were blamed for Trump, even though I and damn near ever Bernie supporter I know voted for Hillary. I can only tell people like your wife to really look at who is the most passionate, even on twitter, because it's a hell of a lot of non-white people and women. This isn't 2016, it's 2020 and you'll see how many people who really inspires by taking a look at who shows up to his rallies in Texas, Nevada, Washington, California.