Tradition sure. Most people don't. But they most assuredly can and do. I speak as the person who had to give a death by power point to my company due to a soldier in our unit getting into a scuffle with a civi that saluted during reveille and as per tradition PowerPoint/education based on history and regulations was the answer for preventive measures.
The only reason I even spoke to this now is the "stolen valor" aspect you presented initially and to inform the rest of the people that feel this is awkward for just anyone to do.
The truly awkward part is the way most do the "military" salute wrong. American or otherwise. I'd say it's a tell tell sign of them not being in the military but there are plenty of soldiers that don't do it correctly either so :shrug:
Completely relate. It's frustrating watching someone LARP something you take pride in. Absolutely nothing wrong with disliking the guy for his actions. And hell, you can still not like him for this, with the knowledge he's not really in the wrong. This time.
V2V Respect.