The person writing this article is almost certainly "rich" by any reasonable standard. Meanwhile, most families making 60k in the US (especially in areas with the best job markets and high COL) - are not. The world income comparison thing at the end is not meaningful in the slightest. If that is actually what he's telling his children, he's doing a great disservice to them.
The difference between 60k income and 200k income matters for a lot more than vacations. It impacts things that will directly affect opportunities for your children. This includes:
- Being able to live in a neighborhood with good public schools - Being able to live in a home without having concerns about the safety of it (both neighborhood safety and environmental safety factors come into play) - Being able to afford additional educational experiences for your children - things like tutoring, summer camps, musical instrument lessons - Having higher status professional connections that can help your child get into schools, internships, jobs, or just expose your child to higher paying career options in general.
The difference in long-term opportunity between middle and upper-middle class is admittedly much smaller than the difference between middle class and poverty, but it's still a real difference. It doesn't do anybody any good to pretend like the children of the wealthy don't actually have a leg-up just because their parents worked hard to get there or achieved class mobility on their own.