flag-waver
Definitions
A person who displays or waves a flag, especially in a ceremonial or patriotic context.
A person who expresses excessive or performative patriotism or nationalistic fervor.
Something, such as a film or book, that is designed to promote patriotic sentiment.
Examples
The politician is a notorious flag-waver who uses patriotic rhetoric to distract from his lack of policy substance.
During the national holiday, the crowd was filled with every type of flag-waver, from young children to elderly veterans.