Because the so-called Social Justice* crowd was flooding him with hatemail over Age of Ultron, because apparently it was toxic, racist, and horribly, horribly sexist.
F-ing fandom...
(*read: internet bullies who don't give a flying fuck about justice, social or otherwise. There are actual people out there fighting for real social justice and actually doing real things. They are wonderful people. Tumblr/Twitter Social Justice is an excuse to bully and belittle)
