Some thoughts on the GRRM mispronunciation BS, from a white anglo guy who taught for three years at an Islamic institution:
1) There are no hard names. There are only names you're accustomed to, and names you aren't. The name is never at fault.

2) Names are history, culture, faith, pain, love, disenfranchisement, power, and more. When you disrespect a name, you disrespect the person, the family, the creed, the nation, and everything else threaded through and around that name.

3) As the teacher (or toastmaster), the responsibility for getting it right is on you.

4) You will sometimes get it wrong.

5) When you mispronounce a name, you do not defend, or backpedal, or blame the name. You apologize sincerely and ask how to get it right. And you make sure you don't make that mistake again.

6) Because you have responsibility, you do your research. You listen for context clues. If you're unsure, you ask. You whisper names to yourself in lunch breaks. You google dialect keys.
Because getting it right is your job.

7) If you're not willing to do your job, then get another job.

100% expecting one of the many ex-students who now follow me here to pop into my mentions with a story that makes me look like a chump.