It's been that way for a while. The creative types tend to be leftists who hate America. So they can't help occasionally writing Captain America (the leading comic book symbol of American national pride) in a way that reflects negatively on America.
Since Steve Englehart in the early 1970's, we've had a steady stream of writers who portray Cap doubting his nation's policy, expressing shame for American policy, even abandoning his uniform because it is a symbol of national pride he no longer feels.
And the readership that sanely feels national pride and doesn't share these anti-American ideals, resents what Marvel and its creative staff are doing.
This could be seen as a metaphor for a U.S. population that feels pride in its country, being governed by an Alinsky-trained Cultural Marxist, who has spent his entire life in the company of Frank Marshall Davis, Willam Ayers, Edward Said, and other anti-American Marxist radicals. Likewise from the positions of control, turning the institutions against the people who believe in them.
