
US flag upside down?
second this.
third

This is the answer.
🏳️⚧️
The neighbor would probably get gunnin' if they saw that
Rainbow, obviously. Or better yet, the rainbow above and "don't tread on me" below.
If not the UFP, maybe the Klingon Empire?
Or:
- A state flag, from a different state. New Mexico has the best one. Or if you live in New Mexico, Minnesota’s new one is pretty good.
- Any of the Our Flag Means Death flags. Or all of them.
- The flag of Antarctica
- A US Pride flag
- A red flag, or maybe a beige one
- New California Republic
- Debian swirl flag
- Church of the Subgenius
A lot of houses near me are flying this one:

That said, if what you fly isn't hateful your neighbor can just deal with it. If there's tension over you not supporting fascism then so be it.
Bowser flag by night, Mushroom Kingdom by day, as Miyamoto intended.
The Esperanto flag

Or if your goal is to piss your neighbor off

Fek! Kial mi forgesis la plej bonan flagon?!?

your life will be much happier if you stop trying to placate people with stunted capability for empathy. nothing you do/don't do will ever be good enough for someone that deep in the propaganda machine.
do whatever the fuck you want (as long as it doesn't hurt others), and tell the manchild/woman to pound sand if it triggers them

Might make more of a statement to simply remove the US flag and have nothing there.
Replacing it with something else makes it look like you've chosen a cause in preference to the USA.
Removing it simply says that you are no longer showing support for the US, with no other message. Also less likely to make you a target.
I don't have a flagpole. I want to put one in, but my wife objects.
The reason she objects is because she thinks it will make us a target.
I want to fly a pride flag under the American flag. The point being that the American flag stands for all Americans, not just the Americans who agree with the current regime.
I'd probably change the lower flag from time to time, depending on events, time of year, or my mood.
Remove the entire pole.
the soviet union flag
The Rainbow Flag is always a good choice. I'd go for the NCR flag from Fallout; that'll have the added benefit of confusing any uninitiated parties.

One from our esteemed neighbors.

more serious I have seen the red rebel symbol from star wars on a white flag at protests.
The rebel symbol from Star Wars has been heavily featured in the anti-ICE movement here in Minnesota, look up the rebel loon. Your suggestion is subtle enough that those who know will probably get it and those who don't will probably just think OP is a nerd.
I fly a pirate flag here for Gasparilla, then usually nothing. We don't have a whole flagpole though.
My kids put a rainbow flag in the window.
American flags on flagpoles left up all night just crack me up. Dudes wanting to proclaim they are so patriotic but then not following the etiquette requirements for that piece of fabric they put so much emphasis on. At school there were routines we had to follow, to put it up each morning and take it down each evening and fold some particular way.
If I had an actual flagpole - I'd make it a Maypole in spring. At Christmas make it a Christmas tree made of string lights. At Halloween put a skeleton stripper on it. At Gasparilla the pirate flag and in the summer use it to help anchor a shade cloth stretching to the house. I don't think I'd usually use it for a flag.
Upside down US flag signalling that the country is in trouble has been used at times.
Fly the flag of Quebec.

This is the way.
For some reason having a flag of any group / org always feels like an extreme radical support. To the point when it looks bad no matter what the flag is promoting.
I feel like this is due to flags providing too little information on your actual views and just screams "I love X". In reality it's always better to properly explain why do you actually like that and what parts of it aren't that good. Because there is always something not that good. In a perfect world flags would work if they act as a conversation starter about your actual views and opinions. But in real world people don't often ask those questions and just make assumptions.
I would actually make a flag that says "I love X. Let's talk about why" to help ignite those conversations instead of making assumptions.
I wish I had your problems.
When we had flagpoles we had a pile of flags to fly. I'd get most of them on AliExpress for cheap.
Universities, states, cities, vikings, pirates, scifi, pride, peace, extinction rebellion, etc. I love flying something for larks more than anything else. Fly what you feel, it's your flagpole.
- Freak
- Pirate
- Planet Express
Flags for Good has a lot of great flags available, if you want to peruse their collection. https://flagsforgood.com/
Could always fly the Verda Stelo as long as you're ok with the possibility of someone trying to speak to you in esperanto because of it
Which are the major widely accepted/supported, progressive movements/orgs in USAmerica?
Maybe flags on that?
Have heard that decent public healthcare has been a concern in USAmerica. Are there any good orgs/movement or flags on that?

That one you linked right there. You already found it. Done.
your freak one.
See if your neighborhood has a flag for it, or fly your city's flag. It's patriotic enough to placate the neighbor but also signals local solidarity.
Obviously the pirate flag is choice.
But real talk, maybe you should fly that pride flag. Show some solidarity and stick it to the haters. You have ever right to and it's showing that supporting these causes are normal and good. If everyone who cared didn't show a flag, then people will think it's just trump country.
I personally do a rainbow American flag from June to July so I can keep it up both months.
CANADA
The one from Our Flag Means Death
My friend has a flag that says “this sucks” I might put up the “be gay do crime” goose flag.
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