Earlier quoted context omitted.
Let's cool down a little here. An irresponsible tweet doesn't really constitute a "personal vendetta" (it's not even personal -- as far as I can tell she never knew their names). And while the post was (apparently, I don't know what the evidence here is) the proximate cause, you really can't say that she "got [him] fired", as she wasn't the employer nor did she advocate for his termination. It's just a bad situation…
BS. I'm getting sick and tired of people not taking responsibility for their actions. Now I do agree with you somewhat. I doubt she saw this "joke" as an opportunity to screw someone over (at least I hope so. If she did, then all bets are off); but that doesn't excuse her wrong. Her actions caused this guy to be fired. She needs to own it. Apoligize, Offer amends and move on.
You could blame the millennia of sexism that set up the situation. You could blame the gender-imbalanced context: it's easy for humans to be insensitive to minority views. You could blame the guy's parents and teachers for not raising him right. You could blame the guy for saying something inappropriate. You could blame his friends for not reigning him in. You could blame Adria for reporting what he said in public. Or you could blame his boss, the person who actually fired him.
Ask yourself: why is she the one you chose to focus on?