Your approach sounds like a confrontational approach. In "The culture map" it is described that the US culture is far less confrontational than e.g. France. It might be difficult to engage in a discussion without disclaimers such as "let me play devil's advocate". As in this book is explained, an American was wondering why the French at the dinner table were laughing together after a heated discussion on a topic short before. A discussion is not a personal attack. However, in the US it is quicker felt this way.

Hence, that people are not trapped in filter bubbles should not be countered by an argument based on a personal confrontational approach about how constructively they engage in political discussions.