Shocking that people who payed over a grand for tickets wanted to come and go when they wanted
Go to the Kennedy Center for a concert, or the Arena Stage for a play just to name to examples- and the ushers make you wait until the time is appropriate to return to your seat. When Nats Park first opened, ushers held up stop signs- holding back fans until a break in action. Thye were trying to teach new fans. Clearly many fans never learned polite behavior aka etiquette!