I am not talking about war anywhere in the world by anyone.
War itself is uncivil. The way it was talked about here was no more uncivil then javascript frameworks are talked about.
It is absurd to demand that war is talked about with reverence and euphemisms. People can talk about it the way they talk about vim or emacs or cultural issues.
Frankly, the emotional reaction against the idea that war could be evil and not cool is likely one of reasons why military propaganda in games or sports bothers people. It is not just pushing people toward profession that is really necessary, it is pushing people to think war is cool and heroic. To like that and to ignore destruction it brinks.
Americans are scared of the truth and don't like being embarrassed - but the evil of their military crimes is not something that can be ignored, and there is absolutely nothing honourable about them.
So yes, be rude to the American war mongers you encounter, who forward the propaganda that theirs is an infallible military and a just state of affairs, because this is far, far from the truth. Such cowardice must be shunned, because - as we have seen recently, the USA is a psychopathic state hell bent on tearing itself apart before it commits further crimes against humanity around the world.
It could be that other people hold different values than you do. They might be fully aware and thinking, and still prefer military action that you detest.
Blind opposition can also exist. Maybe you need to re-evaluate your position.