It says each member will assist the attacked party/parties, as it deems necessary.

My interpretation of the article is that assistance is mandatory. What type of assistance is up to the member to decide

https://www.nato.int/cps/fr/natohq/topics_110496.htm?selectedLocale=en

The ones with the thin metal band that your hair always get caught in?

I remember the sound being worth the pain. Good looking too.

You see it as dismissive. Low effort reply, like they couldn’t be bothered. It’s not inviting continued conversation so you see it as someone telling you to stop talking to them.

If I were to guess. In your eyes. They might as well have replied with “cool story bro”.

Which is now forever a sarcastic term and no one regardless of what you say, will believe that you actually found their story cool.

It’s not the thumbs up in itself that is seen as rude, but the short dismissive affirmative.

Someone that sees it as rude would feel like they put effort into their message and expect some kind of effort back in the reply,

the single emoji response can also make it seem like you didn’t even care to read it, and just say replied with something to make them shut up.