I was taught flag etiquette when I was in school, and I'm a lifelong liberal Democrat. My parents fought in WWII for the values that flag represents.
Neither liberals nor conservatives know any more to stand and wait respectfully when the flag is being raised or lowered in front of a building or house.
Both left-wing and right-wing types wear the flag as clothing. Both types buy American flag paper plates and cups.
Both lefties and righties ignorantly dishonor the flag by flying it to the point it's in tatters or by using it as a car radio antenna cover.
Car dealerships using ever bigger flags to show they are more patriotic than the competition (one of my biggest pet peeves) are owned by liberals and conservatives alike.
Kid Rock is conservative. So is Ted Nugent (who has a flag-themed guitar).
This isn't a partisan issue, not by far.