Yes, public schools should teach the proper guidelines for displaying the American flag. Many children do not have any other way of learning proper etiquette for flying their flag. Boys Scouts of America teaches to protocol to scouters. Girls Scouts of America does as well, but these two groups do not appeal to all students. Parents do not always know the proper guidelines for using, retiring, displaying the American flag. A set curriculum would be important for widespread education of what is and is not acceptable and why. Education on flag etiquette can go a long way.
The guidelines to display the national flag should be taught in public schools. A flag is the pride and a symbol of national unity of any country. Teaching this will also instill nationalism and inculcate the spirit of brotherhood among the students. We will never see people burning our flag again.
There are certain guidelines for displaying the American flag which should be taught in public schools. The US has an established United States flag code, which lays out certain rules regarding the American flag, known as the Public Law 94-344. Though there is no punishment for disobeying this law since it outlines the American flag etiquette, hence teaching these guidelines in public schools is highly recommended.
It is great to be patriotic. Pride in ones country can create less crime and more respectful citizens. Teaching in school how to properly handle and display an American flag can just help strengthen loyalty to ones country, which is always a great thing. It should be taught so everyone knows exactly what is expected.