I don't see any anti-American sentiment in this thread.

I don't know whether the flight attendant acted appropriately. I wasn't there, and we've only heard one side of the story. The OP's swearing obviously didn't help. Everybody on the plane was in a bad mood under the circumstances.

I'm a frequent critic of police practices, but it's not clear to me that the police did anything wrong. They didn't personally observe the interaction with the flight attendant, so they needed to investigate. It appears that the OP was not arrested or charged with a crime. Being led off of the flight probably was embarrassing, but there's no indication that it caused any harm or even any inconvenience.

The most appalling part of the story is the delay waiting for a gate, which is what made everybody so irate in the first place.