In the 1950s, the people running the country were white, Christian, straight males. Since then, women, non-whites and gays have all gained significant power. "Christian values" no longer automatically hold sway. So naturally many white, Christian, straight males feel things are worse. No longer do they feel the same sense of superiority. That's what "Make America Great Again" means to them -- put things back the way they were, so women, blacks, gays are all inferior to us again.