Having worked in product/technical support on and off for almost two decades, I also have noticed some interesting parallels in support interactions with customers from certain countries.
Not all of them were negative, they were just different. Some countries lead with praise and then tangentially ask for a discount. Some countries contact for a legitimate issue/bug which is resolved, and then expect some kind of remuneration for the inconvenience (even if they caused it!), and finally some were almost verbosely thankful and appreciative, re-opening tickets every single time to thank someone vs. just letting the conversation end.
It has really made me rethink customer/client interactions when I have them in person, and also how other countries view my own.