If I had to guess, I'd say that's spun a little bit more to make it look like Reddit management is the bad guy. Having been fired from multiple jobs in the past, unless Reddit management is complete shit, she wouldn't have been fired so abruptly and would have had some inkling that she was going to be terminated. If I had to guess (and this is without knowing any more intricate details than the fact she's fired and that Quora screen capture), she probably didn't communicate well that she didn't feel comfortable doing what she was asked, so it looked like insubordination because to her boss, it might have seemed that she wasn't doing her job rather than she didn't feel comfortable doing what she was being asked.

There are some shit managers, but usually managers attempt to communicate when there's issues and give good warning before terminating except in cases where the company is downsizing or you pissed off the CEO since that happens from higher up. But even then, you'll hear it from fellow employees that the company is removing the dept. or the CEO hates you. I am hard pressed to believe that she was abruptly fired, no matter how well she treated the Reddit community.