He's the longest reigning monarch of all time. Well, out of the ones that we know of at least, but it's unlikely that any ancient kings could have survived so long AND be given the crown at such a young age.
Apparently King Sobhuza had about 180 children that lived past infancy, and estimates are that he had over 1,000 grandchildren. That's nearly 0.1% of the population of Swaziland.
Do you think that when the leader of a foreign country makes a demonstrably true, albeit unflattering, comment about your country's leader that demonstrates that the entire country hates your country?
Seems like a bit of a stretch to me.