>Why is everyone calling Sam “Cap?” They’ve known him years before as the Falcon, why are they calling him by an honorific? It’s not like my homeboys from way back would call me “Doc” just because I got a PHD.>

If you became the President, your homeboys would refer to you as “Mister President”, as tradition and decorum demands.

Certainly there are those who refer to Sam as Sam still, but for those who don’t, it would be beyond disrespectful for them to call him Falcon. He’s Captain America, they use the name.