Fair points are raised about my use of the term "general public." None of us know the demographics of those in the stadium where Trump was booed and targeted with chants of "lock him up." Many thousands of people reside in and around the nation's capitol who's legal, registered-to-vote residence is outside of DC. While the District of Columbia itself is a predominantly blue area, it does not follow that the representation at the ball game is the same.
The point is the same with Trump rallies, is it not? While the rallies concentrate Trump supporters in a building, it does not follow that that crowd represents the district or state in which that building is located.
On another topic, when was the last time Trump appeared at a public event where the audience was not controlled by the event organizers? Given the response at the ball game, I doubt we'll ever again see Trump appear before an audience where he might be booed and hear "lock him up" chants.