Avengers: Age of Ultron has a deleted scene where Captain America arrives in Sokovia and sees graffiti of himself with the word "Fascist" written across his helmet
He throws it back in the jet
The Sokovians saw the Avengers as a foreign military force entering their country without permission. Cap understood that. He removed his helmet to show his face. A soldier, not a symbol.
Marvel cut it. Civil War makes so much more sense with this scene.
Again, he gets graded on a curve. Dude is losing his shit because a reporter pushes back a bit on his lies, and he loses his temper, insults her, and walks out of the interview. And yet, he keeps being presented as a sane and normal person.