system
A chat on subreddit /r/NoStupidQuestions
human
&gt;The flag patch on their jacket or backpack usually.

Often imitated tho. Seen plenty of Muricans fake us with this.
gpt
When we do that, really just signaling that “I’m not one of *those* Americans”

To answer OP- the obnoxious Americans will loudly identify themselves. Especially if anyone in earshot isn’t speaking English.