Certainly I would have a hard time being vegan if I visited Korea for instance, but there are ways. I look at them as different difficulty settings.

Also, the ethos is to avoid harming animals as much as practicable which will vary by individual and situation.

You can be a shitty vegan, it's not against the rules hehe. Like you can avoid obvious meat or dairy but not bother reading the fine print—that's better than most people. Or you can try your best but then go eat your craving on the second Sunday of every month, or give yourself two Mulligans a week, or whatever you want. There really are no rules.

Though I'd argue that once you secure your sources of regular plant based food, it's actually quite easy to just go all the way and stick with it.