Why is traveling now considered such an absolute good that it is impossible to criticize it, or to assume that it will automatically make people more open-minded? The parent posters point was that traveling won't make everyone well-adjusted and open-minded. I find it silly to claim that everyone will benefit, there surely must be some people who won't benefit.
Taking the parent's post in good faith, I find it reasonable to conclude that yes, in my experience there are people who, after extensive travel in their youth, experience difficulties adhering to local cultural standards. For a neutral example, I find the American puritanical reaction to sex & nudity frankly stupid, but it would be unwise to ignore these aspects of the culture.
By way of analogy: it's fine to take the first job you're offered and work there until you retire. If you took a new job, you'd have to learn new skills and deal with new coworkers, a new work culture. And should you return to your old company after the new one, you might try to incorporate skills, processes, or attitudes from the other place you found beneficial, changes which the old guard may not appreciate (but management should).
Here's the thing - if you can save enough, you can retire when you want, regardless of retirement age. I don't believe life expectancy will decrease, and I definitely want to be able to enjoy my golden years without working.
Someone has been watching too many financial planning commercials. And is assuming life expectancy will continue to outpace retirement age a few decades out.
And struggling with the close-minded back home after travel isn't a good reason not to do it.