Being disrespectful a crime? I would love to see you be disrespectful in a courtroom.
I bet you wouldn't be disrespectful at a mosque or Buddhist temple, even though that may not be your religion in your heart.
Many of the anti-American lefties would stand in a foreign country for that countries national anthem.
It's not petty, it's about the left diminishing patriotism in the U.S., because that's something that is so red state and so 1950's.