Given the replies I skimmed here, I'm going to guess my opinion on this may be unpopular but here goes...
Everything everyone has said about your rights, your freedom, and your property is spot on. However... You're violating the gray man philosophy by advertising any opinion publicly to anyone. This sort of thing is exactly why I don't have flags, bumper stickers (except one, ever), etc. I live my life by my actions and have supported police and military charities in the past. I'm a proud freedom loving American and vote pro-freedom as much as there are candidates worthy of supporting. I don't need to fly flags to try to sway others to my opinion or, and I hate to put it this way but that's the way I see it, virtue signal to others that already share my views.
Putting up signs in front of your house that basically scream "I have guns and training" makes you a target for the element you specifically don't want to attract, and I dare say, you're intentionally try to avoid by living where you do. Those of us already on your side aren't the type to come cause you problems and you likely already know where your other neighbors stand if you've got a shooting range on your property.
Since the flags are already up there's no way I'd take them down on account of the snowflakes up the road, but perhaps this is a topic for deeper thought for some folks before they hang their own. Again, I'm absolutely not saying you did anything wrong in a polite society, but we don't have a polite society anymore.
PS - If anyone happens to be unfamiliar with the gray man philosophy, the idea is that you want to be a blur in the memories of other people by doing nothing that makes you stand out in any way. The general idea is that the less strangers know about you, the better off you are. Your friends already know how to find you if you want to be found and people that aren't your friends (such as the morons up the street) don't need to find you.
Again, this is just my opinion and I'm not trying to chastise you or anyone else by sharing it.
I can see where you are going with the Gray Man theory of operation. However there are obvious indicators present already, Understanding that we take several measures to discourage uninvited visitors. None of which are uncommon for the area. ie a strand of hot wire at the first fence line. A second row of fencing across the frontage of the road( It keeps the Goats out of the fruit trees and black berries) so to see it you would not think anything of it. Next we have automatic gate opener which would take some doing to get open. Plus when we are not home Jack and Otis have the run of the front. Otis is 140 Pounds of Great Pyrenees who is very well trained and neither like strangers.
I agree with the theory and try to use as much has I can. Unfortunately when you are already taller than average you tend to stand out a bit, not a whole lot you can do about that, but I do not have any personalized stickers on our personal vehicles, other than AG plates which again are pretty common around here.