You fail to understand the insult because you don't value liberty and individualism. When you say "it's their country" it is misleading. It's as much theirs as it is the other's person who lives next to them and thinks visas and passports are bullshit. My country doesn't belong to me any more than the other person. Why should I and not the other person decide who can visit?
Judging from your suite of comments here, and your downvoting those who engage with you (misuse of down vote), seems you are confused about how both communities and voting are generally agreed to work.
You're also either confused or disingenuous about the motives and beliefs of those trying to talk with you here, mine included. Good way to stay cocooned in a closed-minded point of view.
I almost never downvote anyone, actually, and I would be happy if that information could be made public somehow. People downvoting you were others and I have absolutely no idea who they are. I don't know how can you "judge" that I downvote by looking at my comment history.