That is such a strange article. It shackles Joss Wheadon with this additional moral failing for cheating on his wife as if his feminist ideal should stop him from falling for the trappings that all rich powerful people go through.
Somehow because he has particular views of the equality of men and women, it should give him an above average amount of will power to stop himself from temptation?
Feminism is a political stance not a moral super-power. The great majority of people with access to something will not hold themselves back. Men in positions of power will have women throwing themselves at them. Most men will succumb to that temptation the same way the majority of the population with access to food will eventually succumb to the temptation to overeat.
At some point almost all people will get fat as they get comfortable and older. From all accounts I've heard, nearly all professional atheletes and musicans cheat. If you had beautiful women throwing themselves at you, you would probably succumb to it eventually. Most men do. Women's sex drive and biochemistry is different and most attractive women have had men throwing themselves (or at least have 2nd hand experience through a friend) and thus it isn't equivalent. Most women don't know what it's like to have what you were chasing your whole life, chasing you. It's like being a lion and have gazelles trying to leap into your mouth all the time.
When you add the fact that his casting someone (and he was known for casting relatively unknown actors) could change the course of their entire career and thus life, and most of those who could benefit the most are literally a self-selected group of the most beautiful women in the world, it's no wonder why he cheated.
So, to take all of that and heap some kinda extra moral failure on him is unfair. If she cheated, it wouldn't be some failure of her feminist stance. She would just be someone who cheated.
It was merely a betrayal of a loved one but, doesn't mean that all of a sudden he hates women because he cheated.
> Somehow because he has particular views of the equality of men and women, it should give him an above average amount of will power to stop himself from temptation?
I don't know.
From my own reading of her article, it seemed like her (feminism-related) issue stemmed from him using feminism as both a shield and excuse to pick up women.
But, to _try_ to answer your—perhaps rhetorical—question, I'd say yes to the extent that somebody who talks the talk should walk the walk. Having extramarital affairs isn't respecting your wife. IMO, it's similar to an unabashed anti/non-racist repeatedly using racial slurs. Like, there's a bit of dissonance there that needs to be spoken to.