Beloved director Joss Whedon (“Firefly,” “Buffy the Vampire Slayer,” “The Avengers”) quit Twitter on Monday, but no one is sure exactly why.

The going theory is that Whedon quit after heavy backlash from feminists about the portrayal of women in “The Avengers: Age of Ultron.” Among the complaints were Black Widow’s heart-wrenching monologue about not being able to have children and Laura Barton (Hawkeye’s wife) being pregnant in the kitchen.