Having served in the military, I had to learn to respect a number of different conventions (guest in a foreign nation and all), so I learned that getting people's names, as well as cultural norms, right is critical in both respect and public metrics.  I have not always succeeded in name pronunciations, but I make the effort to try, often asking them to pronounce their name slowly and allowing me to try to get it right.  This is a show of respect which people remember.
One girl that I dated was half-Vietnamese and she had a Vietnamese name, which was difficult to pronounce.  I tried and got it close to right, which she appreciated.  While I was overseas, we had a guy in our unit who was born in Sri Lanka and everyone called him Houdini.  That was because, as it turned out, no one could pronounce his surname, but I could, and he said that I was the first American-born soldier that he had met in the service that could pronounce his real last name (using last names instead of given names is a common thin in the military). Then there are the cultural norms in every country.  Getting those things right, or at least making an effort to, means a lot to the locals, wherever you go.

So, whether it is name pronunciation or cultural behavior, getting, or making a real attempt to get it right, always matters,  It's about earning respect.