Great example! A woman tells it like she sees it (and we all saw the "basket of deplorables" attack the Capitol, right?) and gets labeled "nasty", but TFG gets props for insults that don't even hit the mark.
Well, it's not my assumption, but I do think many Dems today don't believe one of the female candidates can stand up to TFG. They may be conflating them with Hillary, or they may feel women in general are more vulnerable targets on the campaign trail, but I haven't seen much support from Dems for anyone but Biden.
So we're stuck arguing between too much experience and too little experience, but the ones with all the experience are also heavily invested in our current political system. If we want to see any meaningful change, I don't think it's age we should be looking at. I'd vote for Bernie Sanders again and he's 2 years older than Biden. The rest of the candidates from both sides are already beholden to the billionaires.