But why is you visiting it okay, but others not? It's like being stuck in traffic and hating on other drivers. In the article's case, it's their homes, so I can see it being annoying. But for landmarks that get popular, I don't see how one is justified in hating on other people going there. It's just a tragedy of the commons.
I also dislike how Barcelona and others are handling the problem. Taking tourists' money and harassing them.
I say this as someone who grew up in a mountain resort. Yes, it is annoying during winter when people flood to "my nature" and "my ski spots". But if it weren't for those people, my family or no one else would live there as there wouldn't be any jobs. So then it wouldn't be "mine" anyways.