I know that apparently, some American travelers put Canadian flags on their luggage or carry on then claiming they’re from Canada (the dead giveaway on debunking this is their passport, since how can you be “Canadian” when you have US citizenship unless you’re a dual citizen in possession of both nationalities) since some of them have hatred towards the US or feel ashamed of the country due to its internal affairs.
This was definitely a thing back in the early 2000’s, after the US went on its global rampage against brown folks. It wasn’t safe to let people know you were from the US. It also had the unintended consequence of making Canadians look bad, due to the association with rude assholes putting Canadian flags all over their gear.