Well she says in her account the large majority of people at Riot Games are lovely. The problem tends to be that there are powerful people who the company has strong reasons not to fire that perpetuate the worst behavior. Then the culture of ignoring the worst offenders allows other people to get away with little things. And the culture of ignoring things period, eats away at employees's sense of well being and sense that their workplace is fair and looks at them with respect.
I'm sure there are plenty of managers at Riot Games who wouldn't tolerate the stories for a second, but there are a few at or near the top that will and that can ruin an entire workplace.