It's about knee-jerks, not anti-American jerks.
He may not know anything about the constitution. How do you know he's making a political statement of any kind.
Some arsehole comes in and starts climbing a pole at a gas station? Really?
Say they called the cops. The cops come and arrest the guy for trespassing on private property, disturbing the peace, whatever and keep him from endangering himself. All Constitutional too. You ok with that?
Are you drunk?
Any pole climbing was long over, it was done to install the rope.
Flag flying, rope installed, your claimed drama over, and they go out and run the flag down.