Ok so not to spoil the sentiment here but an upside down flag is an emergency signal that will result in people calling up first responders and stuff like that. So this is not a good idea.

I was at school as a kid one time and some kid decided to put the flag up upside down as a joke or something, not realizing what this means. Then a pilot saw it and called the school from the airport asking if there was an emergency. Luckily he didn’t call the cops, but he might have done that too.

In short, this is a recognized emergency signal so shouldn’t be used as a political protest. Police may show up and ask if there’s an emergency then get annoyed, etc.