Why isn't other people's convenience the most important thing in the world? Utilitarian: there are many of them, there is only one of me. Egalitarian: I don't want to me inconvenienced by accepting an alternative pronunciation of my name, so I insist on THEM being inconvenienced? Self-interest: I have some business with them, the less distractions we have getting to it the sooner/better it will get done.

I had plenty of experience with people intentionally calling me mean nicknames in my native language. There is zero overlap between this situation and someone who just wants to have a useful interaction.