Apple stores are in 24 countries, excluding North America that's 22. Which means that most countries don't have a single Apple Store. So not only is your comment rude and inappropriate, it's also incorrect.

There are 195 countries in the world, 23 in North America.

There are 24 countries with Apple stores, 2 in North America.

So, there are 172 countries not in North America, 22 of which have at least one Apple Store.

So, “most countries outside of North America don't have a single Apple Store” is true, though it's even more true that most countries in North America don't have a single Apple store.

How are there 23 countries in North America?

Caribbean and Central America.

The extent of North America is quite country dependent https://en.wikipedia.org/wiki/North_America#Extent