I’m guessing the person with this tattoo gets them colored in once they’ve visited that country, which if so I think that’s pretty cool
It’s just bragging with your privilege.
There’s nothing really exciting about having visited lots of countries anymore. Just means you have a couple grand to burn each year on flights, and don’t care about the climate.
There’s plenty of ways to visit countries that won’t involve flying. Some of those quite CO2 neutral.
Unless you are a pretty serious sailor you’ll struggle with crossing the Atlantic or Pacific though.