No artist is going to change their music or views to not reflect who they are ... I don't think that is what he meant. And I would say in all of the music world your lyrics and music are a reflection of you and your beliefs.
POV: I think what he meant was don't wear your party/political/person shirts, hats etc. Don't sneak in a sign or flag. Do not speak or shout to others about your beliefs. Most certainly do not be verbal towards others who you don't like for whatever your reason. If you are going to his concert, just enjoy the music, dance and have a good time. BUT his words are still his words, and if you don't like them or him don't bring your politics in the door, stay home.
He is not overtly political but most certainly has public views, public actions and clear on the issues he supports. He does speak of a unified world ~ but he also supports issues that folks are divided on.