I "singled out" one party because that's the party that has been big on insisting they are in touch with average Americans. They are the ones supposedly fighting for the little guy against mega corporations, the ones fighting for minorities against the racist white right, the ones fighting for women's rights against a party of extreme woman hating bigots, the ones fighting for gay rights against a nation of homophobes. That's the Democrats' platform for the past several years.
You keep saying Republicans do it too in regards to a story that shows more Americans think Republicans are in touch, especially so for Trump in particular.
Republicans' main talking points the past several years have been the economy, jobs, illegal immigration, terrorism, THE WALL!, repealing Obamacare.
Democrats' main talking points have been playing identity politics and this poll shows it's not working for them.