Certain people get angry if you do not refer to it as GNU/Linux.
I’ve never seen this happen. I’ve heard a lot of people complaining about these people, though.
It’s like veganism. I’ve never met a militant vegan, but I’ve heard tons of people complain about them.
I think it’s an effective strategy to avoid taking about real issues.
It isn’t just a copypasta. As KnowYourMeme points out, it comes from Richard Stallman. Wikipedia has a good article about it here.